qs.stringify throws TypeError on objects with a non-callable constructor.isBuffer property
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cve-program · CVE-2026-82417
Published### Summary `qs.stringify` throws a `TypeError` when it serializes an object whose own `constructor` property has a truthy, non-callable `isBuffer` member. `utils.isBuffer` duck-types buffers by calling `obj.constructor.isBuffer(obj)` after checking only that the property is truthy, so a value such as `{ constructor: { isBuffer: "x" } }` makes the call throw `TypeError: obj.constructor.isBuffer is not a function`. ### Details `lib/stringify.js:127` calls `utils.isBuffer` on every non-primitive value it serializes. `utils.isBuffer` (`lib/utils.js:332`) reads `obj.constructor.isBuffer` and invokes it without verifying that it is a function. `constructor` and `isBuffer` are ordinary property names, so any object carrying them as own properties reaches the unchecked call. Such an object can be built from untrusted input. `qs.parse("x[constructor][isBuffer]=y", { plainObjects: true })` or `{ allowPrototypes: true }` keeps the `constructor` key as an own property (the default parse options drop it), and `JSON.parse("{\"a\":{\"constructor\":{\"isBuffer\":\"x\"}}}")` produces the same shape with no qs option involved. Express 4 with its default `query parser` setting and body-parser with `extended: true` both call `qs.parse` with `allowPrototypes: true`, so on those stacks `req.query` and `req.body` can carry the shape directly. #### PoC ```js var qs = require("qs"); qs.stringify(qs.parse("x[constructor][isBuffer]=y", { plainObjects: true })); qs.stringify(JSON.parse("{\"a\":{\"constructor\":{\"isBuffer\":\"x\"}}}")); // TypeError: obj.constructor.isBuffer is not a function // at Object.isBuffer (lib/utils.js:332:78) // at stringify (lib/stringify.js:127:45) ``` #### Fix `lib/utils.js`, applied in e83d321 on `main` and released as v6.16.0: ```diff - return !!(obj.constructor && obj.constructor.isBuffer && obj.constructor.isBuffer(obj)); + return !!(obj.constructor && typeof obj.constructor.isBuffer === "function" && obj.constructor.isBuffer(obj)); ``` Real `Buffer`, `safer-buffer`, and browserify `buffer` polyfill instances serialize exactly as before; only the throw is removed. ### Affected versions `>=2.2.5 <6.16.0`, fixed in v6.16.0. The unguarded duck-type was introduced in 3768a75 and first shipped in v2.2.5 (September 2014). v2.2.4 and earlier used `Buffer.isBuffer` and are not affected. Every release from v2.2.5 through v6.15.3 contains the unguarded call. ### Impact An unauthenticated request can make any code path that re-serializes attacker-influenced data with `qs.stringify` (for example, rebuilding a query string from `req.query` for a redirect or an upstream request, or serializing a parsed JSON body) throw synchronously. In a typical Node.js HTTP framework the throw is caught by the framework error boundary and the affected request returns a 500; the process survives and other requests are unaffected. Where the call runs outside an error boundary, such as an `async` Express 4 handler (where the throw becomes an unhandled promise rejection) or a background job, the process exits, so the impact in that case depends on the application error handling rather than on qs.
- Source published
- 29 Aug 2026 23:51:27 UTC
- Source modified
- 31 Aug 2026 17:08:24 UTC
- Saved here
- 23 Oct 2026 15:48:27 UTC
- Source terms
- CVE Program Terms of Use
Original source record · Cite this exact observation · Complete original publisher JSON
Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS 3.1 · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 4.0 · 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
euvd · EUVD-2026-68140
Published### Summary `qs.stringify` throws a `TypeError` when it serializes an object whose own `constructor` property has a truthy, non-callable `isBuffer` member. `utils.isBuffer` duck-types buffers by calling `obj.constructor.isBuffer(obj)` after checking only that the property is truthy, so a value such as `{ constructor: { isBuffer: "x" } }` makes the call throw `TypeError: obj.constructor.isBuffer is not a function`. ### Details `lib/stringify.js:127` calls `utils.isBuffer` on every non-primitive value it serializes. `utils.isBuffer` (`lib/utils.js:332`) reads `obj.constructor.isBuffer` and invokes it without verifying that it is a function. `constructor` and `isBuffer` are ordinary property names, so any object carrying them as own properties reaches the unchecked call. Such an object can be built from untrusted input. `qs.parse("x[constructor][isBuffer]=y", { plainObjects: true })` or `{ allowPrototypes: true }` keeps the `constructor` key as an own property (the default parse options drop it), and `JSON.parse("{\"a\":{\"constructor\":{\"isBuffer\":\"x\"}}}")` produces the same shape with no qs option involved. Express 4 with its default `query parser` setting and body-parser with `extended: true` both call `qs.parse` with `allowPrototypes: true`, so on those stacks `req.query` and `req.body` can carry the shape directly. #### PoC ```js var qs = require("qs"); qs.stringify(qs.parse("x[constructor][isBuffer]=y", { plainObjects: true })); qs.stringify(JSON.parse("{\"a\":{\"constructor\":{\"isBuffer\":\"x\"}}}")); // TypeError: obj.constructor.isBuffer is not a function // at Object.isBuffer (lib/utils.js:332:78) // at stringify (lib/stringify.js:127:45) ``` #### Fix `lib/utils.js`, applied in e83d321 on `main` and released as v6.16.0: ```diff - return !!(obj.constructor && obj.constructor.isBuffer && obj.constructor.isBuffer(obj)); + return !!(obj.constructor && typeof obj.constructor.isBuffer === "function" && obj.constructor.isBuffer(obj)); ``` Real `Buffer`, `safer-buffer`, and browserify `buffer` polyfill instances serialize exactly as before; only the throw is removed. ### Affected versions `>=2.2.5 <6.16.0`, fixed in v6.16.0. The unguarded duck-type was introduced in 3768a75 and first shipped in v2.2.5 (September 2014). v2.2.4 and earlier used `Buffer.isBuffer` and are not affected. Every release from v2.2.5 through v6.15.3 contains the unguarded call. ### Impact An unauthenticated request can make any code path that re-serializes attacker-influenced data with `qs.stringify` (for example, rebuilding a query string from `req.query` for a redirect or an upstream request, or serializing a parsed JSON body) throw synchronously. In a typical Node.js HTTP framework the throw is caught by the framework error boundary and the affected request returns a 500; the process survives and other requests are unaffected. Where the call runs outside an error boundary, such as an `async` Express 4 handler (where the throw becomes an unhandled promise rejection) or a background job, the process exits, so the impact in that case depends on the application error handling rather than on qs.
Additional publisher context
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
Original publisher date fields
datePublished: Aug 29, 2026, 11:51:27 PM
dateUpdated: Aug 31, 2026, 5:08:24 PM
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msrc_CVE-2026-82417: qs.stringify throws TypeError on objects with a non-callable constructor.isBuffer property
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CVE-2026-69152 · CVE-2026-73569 · CVE-2026-82417 · CVE-2026-84375
RHSA-2026:86891: Red Hat Security Advisory: RHOAI 3.5.2 - Red Hat OpenShift AI
CVE-2024-14029 · CVE-2026-13697 · CVE-2026-15679 · CVE-2026-15789 · CVE-2026-18427 · CVE-2026-19534 · CVE-2026-37237 · CVE-2026-49825 · CVE-2026-49855 · CVE-2026-54284 · CVE-2026-56859 · CVE-2026-59296 · CVE-2026-59893 · CVE-2026-62243 · CVE-2026-62384 · CVE-2026-63209 · CVE-2026-63374 · CVE-2026-66007 · CVE-2026-68494 · CVE-2026-68497 · CVE-2026-69097 · CVE-2026-69112 · CVE-2026-69152 · CVE-2026-69243 · CVE-2026-69244 · CVE-2026-71281 · CVE-2026-71491 · CVE-2026-73417 · CVE-2026-73502 · CVE-2026-73508 · CVE-2026-73646 · CVE-2026-75838 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76098 · CVE-2026-76169 · CVE-2026-76172 · CVE-2026-76222 · CVE-2026-76905 · CVE-2026-77354 · CVE-2026-77874 · CVE-2026-78676 · CVE-2026-78677 · CVE-2026-78679 · CVE-2026-78682 · CVE-2026-79674 · CVE-2026-79675 · CVE-2026-80205 · CVE-2026-81722 · CVE-2026-81724 · CVE-2026-81725 · CVE-2026-81726 · CVE-2026-81727 · CVE-2026-82397 · CVE-2026-82417 · CVE-2026-84292 · CVE-2026-84375 · CVE-2026-84381 · CVE-2026-84382 · CVE-2026-84394 · CVE-2026-84428 · CVE-2026-84445 · CVE-2026-84469 · CVE-2026-84504 · CVE-2026-84782 · CVE-2026-84961 · CVE-2026-85124 · CVE-2026-85152 · CVE-2026-85525 · CVE-2026-86332 · CVE-2026-87776 · CVE-2026-87817 · CVE-2026-87819 · CVE-2026-88029 · CVE-2026-88031 · CVE-2026-89425 · CVE-2026-91990 · CVE-2026-93348 · CVE-2026-93599 · CVE-2026-93657 · CVE-2026-93749 · CVE-2026-96749 · CVE-2026-96775 · CVE-2026-102925 · CVE-2026-102930 · CVE-2026-102937 · CVE-2026-102938 · CVE-2026-102990 · CVE-2026-104851 · CVE-2026-104852 · CVE-2026-104861 · CVE-2026-104873
RHSA-2026:77656: Red Hat Security Advisory: Red Hat Quay 3.9.27
CVE-2026-17106 · CVE-2026-49825 · CVE-2026-54770 · CVE-2026-59879 · CVE-2026-77403 · CVE-2026-77404 · CVE-2026-77406 · CVE-2026-77409 · CVE-2026-77410 · CVE-2026-77412 · CVE-2026-79921 · CVE-2026-82417 · CVE-2026-84292 · CVE-2026-84394 · CVE-2026-87776
RHSA-2026:67711: Red Hat Security Advisory: RHACS 4.10.8 security and bug fix update
CVE-2026-33818 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-67313 · CVE-2026-67314 · CVE-2026-67320 · CVE-2026-67321 · CVE-2026-75838 · CVE-2026-82417 · CVE-2026-84375
WID-SEC-W-2026-3623: IBM DataPower Gateway: Mehrere Schwachstellen
CVE-2023-53781 · CVE-2025-14087 · CVE-2025-14512 · CVE-2025-21858 · CVE-2025-22105 · CVE-2025-37980 · CVE-2025-38015 · CVE-2025-38097 · CVE-2025-38180 · CVE-2025-38400 · CVE-2025-38405 · CVE-2025-38441 · CVE-2025-38470 · CVE-2025-38653 · CVE-2025-39766 · CVE-2025-39797 · CVE-2025-39866 · CVE-2025-40134 · CVE-2025-48431 · CVE-2025-5278 · CVE-2025-68183 · CVE-2025-68211 · CVE-2025-68214 · CVE-2025-68347 · CVE-2025-68366 · CVE-2025-68724 · CVE-2025-71066 · CVE-2025-71089 · CVE-2026-12143 · CVE-2026-13257 · CVE-2026-13258 · CVE-2026-13757 · CVE-2026-14269 · CVE-2026-14273 · CVE-2026-14496 · CVE-2026-14497 · CVE-2026-14502 · CVE-2026-14507 · CVE-2026-14508 · CVE-2026-14509 · CVE-2026-14888 · CVE-2026-14905 · CVE-2026-14988 · CVE-2026-14990 · CVE-2026-14991 · CVE-2026-14992 · CVE-2026-14999 · CVE-2026-15588 · CVE-2026-15762 · CVE-2026-15781 · CVE-2026-15784 · CVE-2026-15819 · CVE-2026-15822 · CVE-2026-15824 · CVE-2026-16111 · CVE-2026-16159 · CVE-2026-16161 · CVE-2026-16163 · CVE-2026-16164 · CVE-2026-16165 · CVE-2026-16167 · CVE-2026-16169 · CVE-2026-16170 · CVE-2026-16176 · CVE-2026-16177 · CVE-2026-16178 · CVE-2026-16179 · CVE-2026-16181 · CVE-2026-16182 · CVE-2026-16340 · CVE-2026-16439 · CVE-2026-16440 · CVE-2026-16441 · CVE-2026-2100 · CVE-2026-22979 · CVE-2026-22984 · CVE-2026-22990 · CVE-2026-23002 · CVE-2026-23060 · CVE-2026-23110 · CVE-2026-23204 · CVE-2026-23209 · CVE-2026-23216 · CVE-2026-23243 · CVE-2026-23270 · CVE-2026-23392 · CVE-2026-23455 · CVE-2026-2391 · CVE-2026-31411 · CVE-2026-31419 · CVE-2026-31488 · CVE-2026-31508 · CVE-2026-31532 · CVE-2026-31581 · CVE-2026-31607 · CVE-2026-31613 · CVE-2026-31669 · CVE-2026-31677 · CVE-2026-31684 · CVE-2026-31685 · CVE-2026-33845 · CVE-2026-33846 · CVE-2026-3832 · CVE-2026-3833 · CVE-2026-4046 · CVE-2026-41254 · CVE-2026-41602 · CVE-2026-41606 · CVE-2026-41607 · CVE-2026-42009 · CVE-2026-42010 · CVE-2026-42011 · CVE-2026-42012 · CVE-2026-42013 · CVE-2026-42014 · CVE-2026-42015 · CVE-2026-43027 · CVE-2026-43037 · CVE-2026-43038 · CVE-2026-43056 · CVE-2026-43074 · CVE-2026-43116 · CVE-2026-43125 · CVE-2026-43163 · CVE-2026-43190 · CVE-2026-43198 · CVE-2026-43260 · CVE-2026-43284 · CVE-2026-43303 · CVE-2026-43329 · CVE-2026-43499 · CVE-2026-43501 · CVE-2026-43868 · CVE-2026-43870 · CVE-2026-4437 · CVE-2026-4438 · CVE-2026-45852 · CVE-2026-46054 · CVE-2026-46086 · CVE-2026-46116 · CVE-2026-46173 · CVE-2026-46181 · CVE-2026-46242 · CVE-2026-46259 · CVE-2026-46300 · CVE-2026-46331 · CVE-2026-46333 · CVE-2026-46917 · CVE-2026-46968 · CVE-2026-47010 · CVE-2026-47021 · CVE-2026-47027 · CVE-2026-47059 · CVE-2026-47063 · CVE-2026-48144 · CVE-2026-48145 · CVE-2026-5260 · CVE-2026-52923 · CVE-2026-52991 · CVE-2026-53006 · CVE-2026-53009 · CVE-2026-53131 · CVE-2026-53189 · CVE-2026-53264 · CVE-2026-53266 · CVE-2026-5419 · CVE-2026-5450 · CVE-2026-55602 · CVE-2026-55603 · CVE-2026-55968 · CVE-2026-55970 · CVE-2026-58010 · CVE-2026-58011 · CVE-2026-58012 · CVE-2026-58013 · CVE-2026-58014 · CVE-2026-58015 · CVE-2026-58016 · CVE-2026-58662 · CVE-2026-59879 · CVE-2026-59880 · CVE-2026-60147 · CVE-2026-60589 · CVE-2026-61308 · CVE-2026-63913 · CVE-2026-63952 · CVE-2026-64017 · CVE-2026-64530 · CVE-2026-64560 · CVE-2026-70906 · CVE-2026-70907 · CVE-2026-74581 · CVE-2026-82417 · CVE-2026-82562 · CVE-2026-83605 · CVE-2026-83607 · CVE-2026-83608 · CVE-2026-83613 · CVE-2026-83614 · CVE-2026-83615 · CVE-2026-83616 · CVE-2026-83619
RHSA-2026:68766: Red Hat Security Advisory: General availability of the satellite/iop-remediations-rhel9 container image
CVE-2026-12143 · CVE-2026-44705 · CVE-2026-59869 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-82417 · CVE-2026-84375
RHSA-2026:72712: Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update
CVE-2026-5038 · CVE-2026-19534 · CVE-2026-47683 · CVE-2026-55553 · CVE-2026-59869 · CVE-2026-59879 · CVE-2026-82417 · CVE-2026-84375 · CVE-2026-87776 · CVE-2026-88932 · CVE-2026-89011 · CVE-2026-92000 · CVE-2026-92942 · CVE-2026-92958 · CVE-2026-92959 · CVE-2026-92961
RHSA-2026:62544: Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
CVE-2026-82417 · CVE-2026-82562
RHSA-2026:90321: Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.31.0 Release.
CVE-2023-54404 · CVE-2025-62718 · CVE-2026-8643 · CVE-2026-9496 · CVE-2026-12185 · CVE-2026-13697 · CVE-2026-14682 · CVE-2026-15076 · CVE-2026-16308 · CVE-2026-17106 · CVE-2026-18427 · CVE-2026-19203 · CVE-2026-19534 · CVE-2026-39820 · CVE-2026-41178 · CVE-2026-41707 · CVE-2026-42499 · CVE-2026-42502 · CVE-2026-45416 · CVE-2026-47884 · CVE-2026-47886 · CVE-2026-47888 · CVE-2026-47890 · CVE-2026-47892 · CVE-2026-50010 · CVE-2026-55831 · CVE-2026-55833 · CVE-2026-55851 · CVE-2026-56745 · CVE-2026-56746 · CVE-2026-56819 · CVE-2026-56852 · CVE-2026-56854 · CVE-2026-58062 · CVE-2026-59280 · CVE-2026-59282 · CVE-2026-59283 · CVE-2026-59296 · CVE-2026-59313 · CVE-2026-59323 · CVE-2026-59651 · CVE-2026-59887 · CVE-2026-59899 · CVE-2026-59901 · CVE-2026-62243 · CVE-2026-64607 · CVE-2026-67213 · CVE-2026-67312 · CVE-2026-67313 · CVE-2026-67314 · CVE-2026-67320 · CVE-2026-67321 · CVE-2026-68494 · CVE-2026-68497 · CVE-2026-69152 · CVE-2026-69192 · CVE-2026-71290 · CVE-2026-71324 · CVE-2026-71325 · CVE-2026-71327 · CVE-2026-73500 · CVE-2026-73508 · CVE-2026-74835 · CVE-2026-75838 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-76169 · CVE-2026-81521 · CVE-2026-82417 · CVE-2026-82562 · CVE-2026-84292 · CVE-2026-84375 · CVE-2026-84394 · CVE-2026-84428 · CVE-2026-84445 · CVE-2026-84469 · CVE-2026-84504 · CVE-2026-84961 · CVE-2026-85062 · CVE-2026-85124 · CVE-2026-85152 · CVE-2026-85595 · CVE-2026-85597 · CVE-2026-86063 · CVE-2026-87743 · CVE-2026-88004 · CVE-2026-88007 · CVE-2026-88008 · CVE-2026-88009 · CVE-2026-88011 · CVE-2026-88012 · CVE-2026-88031 · CVE-2026-88878 · CVE-2026-88879 · CVE-2026-90711 · CVE-2026-93749 · CVE-2026-100655 · CVE-2026-100656 · CVE-2026-100666 · CVE-2026-101916 · CVE-2026-102925 · CVE-2026-102930 · CVE-2026-103435 · CVE-2026-109618 · CVE-2026-109619
RHSA-2026:95591: Red Hat Security Advisory: Cluster Observability Operator - 1.5
CVE-2026-19534 · CVE-2026-27145 · CVE-2026-33818 · CVE-2026-39821 · CVE-2026-39822 · CVE-2026-39834 · CVE-2026-42504 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-63209 · CVE-2026-75838 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-77301 · CVE-2026-82417 · CVE-2026-84292 · CVE-2026-84304 · CVE-2026-84375 · CVE-2026-84445 · CVE-2026-84961 · CVE-2026-85152 · CVE-2026-87018 · CVE-2026-102276 · CVE-2026-102278 · CVE-2026-109383 · CVE-2026-109829 · CVE-2026-109855 · CVE-2026-109869 · CVE-2026-116591
RHSA-2026:82151: Red Hat Security Advisory: Ansible automation portal Red Hat Enterprise Linux Images
CVE-2026-13697 · CVE-2026-19534 · CVE-2026-47683 · CVE-2026-47686 · CVE-2026-47698 · CVE-2026-54284 · CVE-2026-55553 · CVE-2026-59893 · CVE-2026-71491 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-77037 · CVE-2026-82333 · CVE-2026-82417 · CVE-2026-84292 · CVE-2026-84375 · CVE-2026-84394 · CVE-2026-84961 · CVE-2026-88932 · CVE-2026-92934 · CVE-2026-92935 · CVE-2026-92937 · CVE-2026-92938 · CVE-2026-92939 · CVE-2026-92940 · CVE-2026-92941 · CVE-2026-92942 · CVE-2026-92944 · CVE-2026-92946 · CVE-2026-92947 · CVE-2026-92948 · CVE-2026-92950 · CVE-2026-92951 · CVE-2026-92953 · CVE-2026-92954 · CVE-2026-92955 · CVE-2026-92956 · CVE-2026-92957 · CVE-2026-92958 · CVE-2026-92959 · CVE-2026-92960 · CVE-2026-92961 · CVE-2026-93603 · CVE-2026-93604 · CVE-2026-93605 · CVE-2026-93606
RHSA-2026:72722: Red Hat Security Advisory: Ansible plug-ins for Red Hat Developer Hub Product Release Update
CVE-2026-19534 · CVE-2026-47683 · CVE-2026-55553 · CVE-2026-56859 · CVE-2026-59869 · CVE-2026-82417 · CVE-2026-84375 · CVE-2026-87776 · CVE-2026-88932 · CVE-2026-89011 · CVE-2026-92000 · CVE-2026-92942 · CVE-2026-92958 · CVE-2026-92959 · CVE-2026-92961
RHSA-2026:71450: Red Hat Security Advisory: OpenShift Container Platform 4.20.40 bug fix and security update
CVE-2026-27136 · CVE-2026-33814 · CVE-2026-39829 · CVE-2026-39830 · CVE-2026-39831 · CVE-2026-39832 · CVE-2026-42504 · CVE-2026-46597 · CVE-2026-75885 · CVE-2026-75886 · CVE-2026-75887 · CVE-2026-82417
RHSA-2026:68747: Red Hat Security Advisory: General availability of the satellite/iop-remediations-rhel9 container image
CVE-2026-12143 · CVE-2026-44705 · CVE-2026-59869 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-82417 · CVE-2026-84292 · CVE-2026-84375 · CVE-2026-84394
RHSA-2026:79366: Red Hat Security Advisory: Red Hat Quay 3.10.27
CVE-2026-49825 · CVE-2026-54770 · CVE-2026-59879 · CVE-2026-77403 · CVE-2026-77404 · CVE-2026-77406 · CVE-2026-77409 · CVE-2026-77410 · CVE-2026-77412 · CVE-2026-79921 · CVE-2026-82417 · CVE-2026-87776
NCSC-2026-0431: Kwetsbaarheden verholpen in IBM DataPower Gateway en onderliggende componenten
CVE-2023-53781 · CVE-2025-14087 · CVE-2025-14512 · CVE-2025-21858 · CVE-2025-22105 · CVE-2025-37980 · CVE-2025-38015 · CVE-2025-38097 · CVE-2025-38180 · CVE-2025-38400 · CVE-2025-38405 · CVE-2025-38441 · CVE-2025-38470 · CVE-2025-38653 · CVE-2025-39766 · CVE-2025-39797 · CVE-2025-39866 · CVE-2025-40134 · CVE-2025-48431 · CVE-2025-5278 · CVE-2025-68183 · CVE-2025-68211 · CVE-2025-68214 · CVE-2025-68347 · CVE-2025-68366 · CVE-2025-68724 · CVE-2025-71066 · CVE-2025-71089 · CVE-2026-12143 · CVE-2026-13257 · CVE-2026-13258 · CVE-2026-13757 · CVE-2026-14269 · CVE-2026-14273 · CVE-2026-14496 · CVE-2026-14497 · CVE-2026-14502 · CVE-2026-14507 · CVE-2026-14508 · CVE-2026-14509 · CVE-2026-14888 · CVE-2026-14905 · CVE-2026-14988 · CVE-2026-14990 · CVE-2026-14991 · CVE-2026-14992 · CVE-2026-14999 · CVE-2026-15588 · CVE-2026-15762 · CVE-2026-15781 · CVE-2026-15784 · CVE-2026-15819 · CVE-2026-15822 · CVE-2026-15824 · CVE-2026-16111 · CVE-2026-16159 · CVE-2026-16161 · CVE-2026-16163 · CVE-2026-16164 · CVE-2026-16165 · CVE-2026-16167 · CVE-2026-16169 · CVE-2026-16170 · CVE-2026-16176 · CVE-2026-16177 · CVE-2026-16178 · CVE-2026-16179 · CVE-2026-16181 · CVE-2026-16182 · CVE-2026-16340 · CVE-2026-16439 · CVE-2026-16440 · CVE-2026-16441 · CVE-2026-2100 · CVE-2026-22979 · CVE-2026-22984 · CVE-2026-22990 · CVE-2026-23002 · CVE-2026-23060 · CVE-2026-23110 · CVE-2026-23204 · CVE-2026-23209 · CVE-2026-23216 · CVE-2026-23243 · CVE-2026-23270 · CVE-2026-23392 · CVE-2026-23455 · CVE-2026-2391 · CVE-2026-31411 · CVE-2026-31419 · CVE-2026-31488 · CVE-2026-31508 · CVE-2026-31532 · CVE-2026-31581 · CVE-2026-31607 · CVE-2026-31613 · CVE-2026-31669 · CVE-2026-31677 · CVE-2026-31684 · CVE-2026-31685 · CVE-2026-33845 · CVE-2026-33846 · CVE-2026-3832 · CVE-2026-3833 · CVE-2026-4046 · CVE-2026-41254 · CVE-2026-41602 · CVE-2026-41606 · CVE-2026-41607 · CVE-2026-42009 · CVE-2026-42010 · CVE-2026-42011 · CVE-2026-42012 · CVE-2026-42013 · CVE-2026-42014 · CVE-2026-42015 · CVE-2026-43027 · CVE-2026-43037 · CVE-2026-43038 · CVE-2026-43056 · CVE-2026-43074 · CVE-2026-43116 · CVE-2026-43125 · CVE-2026-43163 · CVE-2026-43190 · CVE-2026-43198 · CVE-2026-43260 · CVE-2026-43284 · CVE-2026-43303 · CVE-2026-43329 · CVE-2026-43499 · CVE-2026-43501 · CVE-2026-43868 · CVE-2026-43870 · CVE-2026-4437 · CVE-2026-4438 · CVE-2026-45852 · CVE-2026-46054 · CVE-2026-46086 · CVE-2026-46116 · CVE-2026-46173 · CVE-2026-46181 · CVE-2026-46242 · CVE-2026-46259 · CVE-2026-46300 · CVE-2026-46331 · CVE-2026-46333 · CVE-2026-46917 · CVE-2026-46968 · CVE-2026-47010 · CVE-2026-47021 · CVE-2026-47027 · CVE-2026-47059 · CVE-2026-47063 · CVE-2026-48144 · CVE-2026-48145 · CVE-2026-5260 · CVE-2026-52923 · CVE-2026-52991 · CVE-2026-53006 · CVE-2026-53009 · CVE-2026-53131 · CVE-2026-53189 · CVE-2026-53264 · CVE-2026-53266 · CVE-2026-5419 · CVE-2026-5450 · CVE-2026-55602 · CVE-2026-55603 · CVE-2026-55968 · CVE-2026-55970 · CVE-2026-58010 · CVE-2026-58011 · CVE-2026-58012 · CVE-2026-58013 · CVE-2026-58014 · CVE-2026-58015 · CVE-2026-58016 · CVE-2026-58662 · CVE-2026-59879 · CVE-2026-59880 · CVE-2026-60147 · CVE-2026-60589 · CVE-2026-61308 · CVE-2026-63913 · CVE-2026-63952 · CVE-2026-64017 · CVE-2026-64530 · CVE-2026-64560 · CVE-2026-70906 · CVE-2026-70907 · CVE-2026-74581 · CVE-2026-82417 · CVE-2026-82562 · CVE-2026-83605 · CVE-2026-83607 · CVE-2026-83608 · CVE-2026-83613 · CVE-2026-83614 · CVE-2026-83615 · CVE-2026-83616 · CVE-2026-83619
RHSA-2026:79088: Red Hat Security Advisory: Red Hat Developer Hub 1.10.5 release.
CVE-2026-13697 · CVE-2026-14456 · CVE-2026-18798 · CVE-2026-19534 · CVE-2026-47683 · CVE-2026-47686 · CVE-2026-47698 · CVE-2026-55553 · CVE-2026-63072 · CVE-2026-63076 · CVE-2026-67213 · CVE-2026-67214 · CVE-2026-67422 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-77037 · CVE-2026-77078 · CVE-2026-82333 · CVE-2026-82417 · CVE-2026-84292 · CVE-2026-84375 · CVE-2026-84394 · CVE-2026-84445 · CVE-2026-84961 · CVE-2026-87776 · CVE-2026-88932 · CVE-2026-89011 · CVE-2026-92934 · CVE-2026-92935 · CVE-2026-92937 · CVE-2026-92938 · CVE-2026-92939 · CVE-2026-92940 · CVE-2026-92941 · CVE-2026-92942 · CVE-2026-92944 · CVE-2026-92946 · CVE-2026-92947 · CVE-2026-92948 · CVE-2026-92950 · CVE-2026-92951 · CVE-2026-92953 · CVE-2026-92954 · CVE-2026-92955 · CVE-2026-92956 · CVE-2026-92957 · CVE-2026-92958 · CVE-2026-92959 · CVE-2026-92960 · CVE-2026-92961 · CVE-2026-93603 · CVE-2026-93604 · CVE-2026-93605 · CVE-2026-93606
RHSA-2026:63164: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
CVE-2026-8595 · CVE-2026-8609 · CVE-2026-9765 · CVE-2026-17033 · CVE-2026-19197 · CVE-2026-21723 · CVE-2026-33382 · CVE-2026-82417 · CVE-2026-82562 · CVE-2026-84375
- Source published
- Aug 29, 2026, 11:51:27 PM (timezone not stated)
- Source modified
- Aug 31, 2026, 5:08:24 PM (timezone not stated)
- Saved here
- 14 Nov 2026 03:07:52 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
Original source record · Cite this exact observation · Complete original publisher JSON
Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
EUVD CVSS 4.0 · 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
nvd · CVE-2026-82417
Published### Summary `qs.stringify` throws a `TypeError` when it serializes an object whose own `constructor` property has a truthy, non-callable `isBuffer` member. `utils.isBuffer` duck-types buffers by calling `obj.constructor.isBuffer(obj)` after checking only that the property is truthy, so a value such as `{ constructor: { isBuffer: "x" } }` makes the call throw `TypeError: obj.constructor.isBuffer is not a function`. ### Details `lib/stringify.js:127` calls `utils.isBuffer` on every non-primitive value it serializes. `utils.isBuffer` (`lib/utils.js:332`) reads `obj.constructor.isBuffer` and invokes it without verifying that it is a function. `constructor` and `isBuffer` are ordinary property names, so any object carrying them as own properties reaches the unchecked call. Such an object can be built from untrusted input. `qs.parse("x[constructor][isBuffer]=y", { plainObjects: true })` or `{ allowPrototypes: true }` keeps the `constructor` key as an own property (the default parse options drop it), and `JSON.parse("{\"a\":{\"constructor\":{\"isBuffer\":\"x\"}}}")` produces the same shape with no qs option involved. Express 4 with its default `query parser` setting and body-parser with `extended: true` both call `qs.parse` with `allowPrototypes: true`, so on those stacks `req.query` and `req.body` can carry the shape directly. #### PoC ```js var qs = require("qs"); qs.stringify(qs.parse("x[constructor][isBuffer]=y", { plainObjects: true })); qs.stringify(JSON.parse("{\"a\":{\"constructor\":{\"isBuffer\":\"x\"}}}")); // TypeError: obj.constructor.isBuffer is not a function // at Object.isBuffer (lib/utils.js:332:78) // at stringify (lib/stringify.js:127:45) ``` #### Fix `lib/utils.js`, applied in e83d321 on `main` and released as v6.16.0: ```diff - return !!(obj.constructor && obj.constructor.isBuffer && obj.constructor.isBuffer(obj)); + return !!(obj.constructor && typeof obj.constructor.isBuffer === "function" && obj.constructor.isBuffer(obj)); ``` Real `Buffer`, `safer-buffer`, and browserify `buffer` polyfill instances serialize exactly as before; only the throw is removed. ### Affected versions `>=2.2.5 <6.16.0`, fixed in v6.16.0. The unguarded duck-type was introduced in 3768a75 and first shipped in v2.2.5 (September 2014). v2.2.4 and earlier used `Buffer.isBuffer` and are not affected. Every release from v2.2.5 through v6.15.3 contains the unguarded call. ### Impact An unauthenticated request can make any code path that re-serializes attacker-influenced data with `qs.stringify` (for example, rebuilding a query string from `req.query` for a redirect or an upstream request, or serializing a parsed JSON body) throw synchronously. In a typical Node.js HTTP framework the throw is caught by the framework error boundary and the affected request returns a 500; the process survives and other requests are unaffected. Where the call runs outside an error boundary, such as an `async` Express 4 handler (where the throw becomes an unhandled promise rejection) or a background job, the process exits, so the impact in that case depends on the application error handling rather than on qs.
Additional publisher context
NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.
Source analysis status: Awaiting Analysis
Weakness classifications: CWE-248 · CWE-703
Original publisher date fields
published: 2026-08-30T00:16:34.657
lastModified: 2026-09-03T18:00:36.970
- Source published
- 30 Aug 2026 00:16:34 UTC
- Source modified
- 3 Sep 2026 18:00:36 UTC
- Saved here
- 25 Oct 2026 16:19:10 UTC
- Source terms
- NIST NVD usage terms; underlying source attribution retained
Original source record · Cite this exact observation · Complete original publisher JSON
Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS 4.0 · 7ffcee3d-2c14-4c3e-b844-86c6a321a158 · Secondary · 6.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 · 7ffcee3d-2c14-4c3e-b844-86c6a321a158 · Secondary · 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
osv · GHSA-4mjr-xmp4-gh2g
Published### Summary `qs.stringify()` calls `utils.isBuffer()` on every value it serializes, and `utils.isBuffer()` invokes `obj.constructor.isBuffer(obj)` without checking that it is callable. A value whose own `constructor.isBuffer` is a non-function makes `qs` call a non-callable and throw `TypeError`. Such a value is produced **by `qs.parse` itself** from an untrusted query string when `plainObjects: true` or `allowPrototypes: true` is set, so a pure-`qs` `parse` → `stringify` round-trip — no `JSON.parse` — turns an unauthenticated query string into an uncaught throw. An attacker-controlled `parse` input reaches the host application's availability asset — via `qs`'s own recommended `plainObjects` mitigation — and triggers an uncaught exception during a `parse` → `stringify` round-trip. ### Details `utils.isBuffer` runs at `lib/stringify.js:127` for every serialized value: ```js if (isNonNullishPrimitive(obj) || utils.isBuffer(obj)) { ... } ``` `utils.isBuffer` (`lib/utils.js:327-333`) invokes `obj.constructor.isBuffer` without verifying it is callable: ```js var isBuffer = function isBuffer(obj) { if (!obj || typeof obj !== 'object') { return false; } return !!(obj.constructor && obj.constructor.isBuffer && obj.constructor.isBuffer(obj)); }; ``` `constructor` and `isBuffer` are ordinary keys. `qs.parse` with `plainObjects: true` or `allowPrototypes: true` keeps them as own properties, so the parsed value carries a non-function `constructor.isBuffer`; `stringify` then calls a non-callable and throws `TypeError`. By contrast `utils.isRegExp` uses a brand check (`Object.prototype.toString`); the missing guard here is an internal inconsistency, not a platform limitation. ### Trust Boundary Note `qs.stringify` alone treats its input as caller-constructed, so serializing a hostile object could be argued outside its contract. This report does not depend on that framing: the malicious shape is produced by **`qs.parse`, whose input is untrusted by design**. `qs.parse` normally strips a `constructor` key via its prototype guard, but with the documented options `plainObjects: true` or `allowPrototypes: true` the key survives and lands as an own property. Feeding the parsed object back into `qs.stringify` — the standard round-trip in gateways and request-forwarders — then hits the unchecked call. ### PoC `poc02c_isBuffer_qs_only_roundtrip.js` — pure-`qs` chain, no `JSON.parse`; an untrusted query string alone reaches the throw: ```js 'use strict'; var qs = require('qs'); var untrustedQueryString = 'x%5Bconstructor%5D%5BisBuffer%5D=y'; // x[constructor][isBuffer]=y var parsed = qs.parse(untrustedQueryString, { plainObjects: true }); console.log('[parse] kept constructor key:', JSON.stringify(parsed)); try { qs.stringify(parsed); console.log('[stringify] no throw (unexpected)'); } catch (e) { console.log('[stringify] DoS reproduced ->', e.constructor.name + ':', e.message); } ``` `poc02_isBuffer.js` — the minimal defect: ```js 'use strict'; var qs = require('qs'); try { qs.stringify(JSON.parse('{"a":{"constructor":{"isBuffer":"x"}}}')); } catch (e) { console.log('[A] DoS reproduced ->', e.constructor.name + ':', e.message); } ``` `poc02b_isBuffer_async_crash.js` — worker death in an async sink: ```js 'use strict'; var qs = require('qs'); function handleRequestAsync(clientJsonBody) { try { setImmediate(function () { // async continuation, outside the try qs.stringify(JSON.parse(clientJsonBody)); // throws here, uncaught }); console.log('[handler] returned 200 synchronously; async work scheduled'); } catch (e) { console.log('[handler] caught synchronously (will NOT happen):', e.message); } } process.on('exit', function (code) { console.log('[proc] process exiting with code:', code); }); handleRequestAsync('{"filters":{"constructor":{"isBuffer":"x"}}}'); ``` ### Execution Steps ```bash cd poc npm install [email protected] node poc02c_isBuffer_qs_only_roundtrip.js # pure qs parse->stringify -> TypeError node poc02_isBuffer.js # minimal defect -> TypeError inside stringify node poc02b_isBuffer_async_crash.js # async sink -> uncaught throw -> exit code 1 ``` ### Reproduction Evidence `poc02c_isBuffer_qs_only_roundtrip.js` : ``` [parse] kept constructor key: {"x":{"constructor":{"isBuffer":"y"}}} [stringify] DoS reproduced -> TypeError: obj.constructor.isBuffer is not a function ``` `poc02_isBuffer.js`: ``` [A] DoS reproduced -> TypeError: obj.constructor.isBuffer is not a function ``` `poc02b_isBuffer_async_crash.js` : ``` [handler] returned 200 synchronously; async work scheduled [proc] process exiting with code: 1 TypeError: obj.constructor.isBuffer is not a function at Object.isBuffer (.../qs/lib/utils.js:332:78) at stringify (.../qs/lib/stringify.js:127:45) === EXIT CODE: 1 === ``` The pure-`qs` round-trip shows the malicious shape originates from `qs.parse` of an untrusted query string, with no `JSON.parse`. The synchronous `try/catch` in the async case does not catch the throw; the process exits with code 1, denying service to all requests on that worker. ### Impact An unauthenticated request degrades any endpoint that re-serializes deserialized client data with `qs.stringify`. The primary impact is a per-request failure: the handler throws and the framework returns HTTP 500. Where the call sits in an unguarded async continuation, the throw escapes and the worker process exits, denying service to all requests it was handling, which means a higher impact that depends on the application's error handling, not on `qs`. ### Recommended Fix Replace the duck-type with a brand check mirroring `utils.isRegExp`: ```js var isBuffer = function isBuffer(obj) { if (!obj || typeof obj !== 'object') { return false; } if (typeof Buffer !== 'undefined' && typeof Buffer.isBuffer === 'function') { return Buffer.isBuffer(obj); } return Object.prototype.toString.call(obj) === '[object Uint8Array]'; }; ``` If duck-typing must remain, require `typeof obj.constructor.isBuffer === 'function'` before invoking and wrap the call in `try/catch`.
- Source published
- 2 Sep 2026 14:45:13 UTC
- Source modified
- 10 Sep 2026 03:51:14 UTC
- Saved here
- 24 Oct 2026 13:17:17 UTC
- Source terms
- GitHub Advisory Database · CC-BY-4.0
Original source record · Cite this exact observation · Complete original publisher JSON
Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.
CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Publisher rating · MODERATE