GHSA-2mjp-6q6p-2qxmPublished

undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

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cve-program · CVE-2026-1525

Published

Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire. Who is impacted: * Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as flat arrays * Applications that accept user-controlled header names without case-normalization Potential consequences: * Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-Length headers (400 Bad Request) * HTTP Request Smuggling: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking

Source published: 12 Mar 2026 19:56:55 UTC
Source modified: 12 Mar 2026 20:46:13 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 · 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

euvd · EUVD-2026-11685

Published

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: Mar 12, 2026, 7:56:55 PM

dateUpdated: Mar 12, 2026, 8:46:13 PM

15 related source bulletins · separate from aliases

RHSA-2026:7350: Red Hat Security Advisory: nodejs:24 security update

CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1527 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-2581 · CVE-2026-21637 · CVE-2026-21710 · CVE-2026-21711 · CVE-2026-21712 · CVE-2026-21713 · CVE-2026-21714 · CVE-2026-21715 · CVE-2026-21716 · CVE-2026-21717 · CVE-2026-25547 · CVE-2026-26996 · CVE-2026-27135

RHSA-2026:7983: Red Hat Security Advisory: nodejs:22 security update

CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-21710 · CVE-2026-25547 · CVE-2026-26996 · CVE-2026-27135 · CVE-2026-27904

RHSA-2026:17789: Red Hat Security Advisory: Red Hat build of Cryostat 4.2.0: new RHEL 9 container image security update

CVE-2026-1002 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-4800 · CVE-2026-4926 · CVE-2026-33186 · CVE-2026-33813 · CVE-2026-33815 · CVE-2026-33816 · CVE-2026-33870 · CVE-2026-33871 · CVE-2026-34986 · CVE-2026-39852 · CVE-2026-40895

RHSA-2026:7675: Red Hat Security Advisory: nodejs24 security update

RHSA-2026:21772: Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.28.0 Release.

CVE-2025-14813 · CVE-2025-68121 · CVE-2026-0636 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-1605 · CVE-2026-2229 · CVE-2026-2327 · CVE-2026-5588 · CVE-2026-26996 · CVE-2026-27904 · CVE-2026-29074 · CVE-2026-30827 · CVE-2026-31802 · CVE-2026-32141 · CVE-2026-32280 · CVE-2026-32282 · CVE-2026-32305 · CVE-2026-33252 · CVE-2026-33810 · CVE-2026-34742 · CVE-2026-35051 · CVE-2026-39858 · CVE-2026-40477 · CVE-2026-40478 · CVE-2026-40611 · CVE-2026-40895 · CVE-2026-40912 · CVE-2026-40972 · CVE-2026-40973 · CVE-2026-40975 · CVE-2026-41240 · CVE-2026-42033 · CVE-2026-42035 · CVE-2026-42039 · CVE-2026-42041 · CVE-2026-42043 · CVE-2026-42044

RHSA-2026:7670: Red Hat Security Advisory: nodejs:24 security update

RHSA-2026:7080: Red Hat Security Advisory: nodejs22 security update

CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-21710 · CVE-2026-25547 · CVE-2026-26996 · CVE-2026-27135 · CVE-2026-27904

RHSA-2026:56431: Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.27 security, enhancement & bug fix update

CVE-2025-61726 · CVE-2025-61729 · CVE-2025-64718 · CVE-2025-68470 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1527 · CVE-2026-2229 · CVE-2026-6321 · CVE-2026-6322 · CVE-2026-6733 · CVE-2026-6734 · CVE-2026-9358 · CVE-2026-9679 · CVE-2026-9697 · CVE-2026-11525 · CVE-2026-12143 · CVE-2026-12151 · CVE-2026-13149 · CVE-2026-13676 · CVE-2026-22036 · CVE-2026-25645 · CVE-2026-33186 · CVE-2026-33349 · CVE-2026-33671 · CVE-2026-33672 · CVE-2026-33750 · CVE-2026-34043 · CVE-2026-34986 · CVE-2026-35469 · CVE-2026-39821 · CVE-2026-40181 · CVE-2026-41305 · CVE-2026-41650 · CVE-2026-41907 · CVE-2026-42342 · CVE-2026-45409 · CVE-2026-45736 · CVE-2026-48779 · CVE-2026-48801 · CVE-2026-53550 · CVE-2026-59869

RHSA-2026:9742: Red Hat Security Advisory: Red Hat Developer Hub 1.8.6 release.

CVE-2025-62718 · CVE-2025-69534 · CVE-2025-69873 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-3118 · CVE-2026-4800 · CVE-2026-4926 · CVE-2026-25679 · CVE-2026-26996 · CVE-2026-27601 · CVE-2026-27904 · CVE-2026-29063 · CVE-2026-29074 · CVE-2026-29186 · CVE-2026-32141 · CVE-2026-33036 · CVE-2026-33228 · CVE-2026-33891 · CVE-2026-33894 · CVE-2026-33895 · CVE-2026-33896 · CVE-2026-39983 · CVE-2026-40175

RHSA-2026:7123: Red Hat Security Advisory: nodejs:22 security update

CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-21710 · CVE-2026-25547 · CVE-2026-26996 · CVE-2026-27135 · CVE-2026-27904

RHSA-2026:13826: Red Hat Security Advisory: Red Hat Developer Hub 1.9.4 release.

CVE-2025-62718 · CVE-2025-69534 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-3118 · CVE-2026-4800 · CVE-2026-4926 · CVE-2026-27601 · CVE-2026-27904 · CVE-2026-29063 · CVE-2026-29074 · CVE-2026-29186 · CVE-2026-32141 · CVE-2026-32280 · CVE-2026-32282 · CVE-2026-33228 · CVE-2026-33891 · CVE-2026-33894 · CVE-2026-33895 · CVE-2026-33896 · CVE-2026-39983 · CVE-2026-40175 · CVE-2026-40895

RHSA-2026:7310: Red Hat Security Advisory: nodejs22 security update

CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-21710 · CVE-2026-25547 · CVE-2026-26996 · CVE-2026-27135 · CVE-2026-27904

WID-SEC-W-2026-0933: IBM App Connect Enterprise (Hono und Undici): Mehrere Schwachstellen

CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-2581 · CVE-2026-29045 · CVE-2026-29085 · CVE-2026-29086 · CVE-2026-1527

RHSA-2026:7302: Red Hat Security Advisory: nodejs:22 security update

CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-21710 · CVE-2026-25547 · CVE-2026-26996 · CVE-2026-27135 · CVE-2026-27904

RHSA-2026:73987: Red Hat Security Advisory: RHOAI 3.3.7 - Red Hat OpenShift AI

CVE-2025-61726 · CVE-2025-66471 · CVE-2025-71408 · CVE-2026-1525 · CVE-2026-1526 · CVE-2026-1528 · CVE-2026-2229 · CVE-2026-5422 · CVE-2026-6321 · CVE-2026-6734 · CVE-2026-9697 · CVE-2026-11816 · CVE-2026-11822 · CVE-2026-11824 · CVE-2026-12151 · CVE-2026-13149 · CVE-2026-15154 · CVE-2026-15378 · CVE-2026-16221 · CVE-2026-16745 · CVE-2026-18951 · CVE-2026-23490 · CVE-2026-25681 · CVE-2026-27136 · CVE-2026-27489 · CVE-2026-27893 · CVE-2026-28356 · CVE-2026-28500 · CVE-2026-28684 · CVE-2026-31230 · CVE-2026-31958 · CVE-2026-32274 · CVE-2026-32286 · CVE-2026-32597 · CVE-2026-33186 · CVE-2026-33231 · CVE-2026-33245 · CVE-2026-33811 · CVE-2026-33814 · CVE-2026-33815 · CVE-2026-33816 · CVE-2026-34445 · CVE-2026-34986 · CVE-2026-34993 · CVE-2026-35397 · CVE-2026-35536 · CVE-2026-39821 · CVE-2026-39828 · CVE-2026-39829 · CVE-2026-39830 · CVE-2026-39831 · CVE-2026-39832 · CVE-2026-39835 · CVE-2026-40110 · CVE-2026-41242 · CVE-2026-42215 · CVE-2026-42294 · CVE-2026-42296 · CVE-2026-42297 · CVE-2026-42338 · CVE-2026-42502 · CVE-2026-42508 · CVE-2026-44240 · CVE-2026-44431 · CVE-2026-44432 · CVE-2026-44727 · CVE-2026-44843 · CVE-2026-45736 · CVE-2026-46595 · CVE-2026-48526 · CVE-2026-48586 · CVE-2026-48710 · CVE-2026-48746 · CVE-2026-48779 · CVE-2026-49855 · CVE-2026-53550 · CVE-2026-54058 · CVE-2026-54283 · CVE-2026-55969 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-59197 · CVE-2026-59199 · CVE-2026-59200 · CVE-2026-59204 · CVE-2026-59205 · CVE-2026-59869 · CVE-2026-59873 · CVE-2026-59874 · CVE-2026-59884 · CVE-2026-59885 · CVE-2026-59886 · CVE-2026-62384 · CVE-2026-63310 · CVE-2026-64834 · CVE-2026-64835 · CVE-2026-66036 · CVE-2026-66037 · CVE-2026-66038 · CVE-2026-66040 · CVE-2026-67322 · CVE-2026-67323 · CVE-2026-67325 · CVE-2026-68770 · CVE-2026-69152 · CVE-2026-69192 · CVE-2026-69243 · CVE-2026-69244 · CVE-2026-71281 · CVE-2026-73089 · CVE-2026-73415 · CVE-2026-73417 · CVE-2026-73627 · CVE-2026-78682 · CVE-2026-79674 · CVE-2026-79675 · CVE-2026-80205 · CVE-2026-81722 · CVE-2026-81724 · CVE-2026-81727 · CVE-2026-84375 · CVE-2026-84445

Source published: Mar 12, 2026, 7:56:55 PM (timezone not stated)
Source modified: Mar 12, 2026, 8:46:13 PM (timezone not stated)
Saved here: 15 Nov 2026 07:32:48 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 3.1 · 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

nvd · CVE-2026-1525

Published

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: Analyzed

Weakness classifications: CWE-444

Original publisher date fields

published: 2026-03-12T20:16:02.670

lastModified: 2026-06-17T10:15:59.927

1 source CPE criteria · context only

cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 12 Mar 2026 20:16:02 UTC
Source modified: 17 Jun 2026 10:15:59 UTC
Saved here: 25 Oct 2026 05:17:25 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 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary · 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS 3.1 · [email protected] · Primary · 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

osv · GHSA-2mjp-6q6p-2qxm

Published

### Impact Undici allows duplicate HTTP `Content-Length` headers when they are provided in an array with case-variant names (e.g., `Content-Length` and `content-length`). This produces malformed HTTP/1.1 requests with multiple conflicting `Content-Length` values on the wire. **Who is impacted:** - Applications using `undici.request()`, `undici.Client`, or similar low-level APIs with headers passed as flat arrays - Applications that accept user-controlled header names without case-normalization **Potential consequences:** - **Denial of Service**: Strict HTTP parsers (proxies, servers) will reject requests with duplicate `Content-Length` headers (400 Bad Request) - **HTTP Request Smuggling**: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking ### Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later. ### Workarounds If upgrading is not immediately possible: 1. **Validate header names**: Ensure no duplicate `Content-Length` headers (case-insensitive) are present before passing headers to undici 2. **Use object format**: Pass headers as a plain object (`{ 'content-length': '123' }`) rather than an array, which naturally deduplicates by key 3. **Sanitize user input**: If headers originate from user input, normalize header names to lowercase and reject duplicates

Source published: 13 Mar 2026 20:07:03 UTC
Source modified: 10 Sep 2026 03:50:36 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:L/A:L

Publisher rating · MODERATE