{"id":"EUVD-2026-93973","revision":null,"records":[{"revision":"4db3a63bf4e74885bd9e580613a515db","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-106448","aliases":[],"title":"StableLib: Prototype poisoning via `__proto__` map keys in CBOR decoding","description":"StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key named __proto__ invokes the inherited prototype setter instead of creating an ordinary own property, allowing the decoded object's prototype to contain attacker-controlled authorization or feature-flag values. Downstream code that trusts normal property lookup or merges the decoded object can therefore make security-sensitive decisions using inherited attacker data. This issue is fixed in version 2.0.4.","state":0,"publishedAt":"2026-10-06T19:45:02.616+00:00","modifiedAt":"2026-10-07T17:07:38.703+00:00","affected":[{"ecosystem":"Vendor product","name":"stablelib","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"StableLib\",\n                    \"product\": \"stablelib\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.0.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","score":8.9,"severity":"HIGH"}],"references":["https://github.com/StableLib/stablelib/security/advisories/GHSA-w48f-fwg7-ww6p","https://github.com/StableLib/stablelib/commit/0f153a63b7552a0e8721f640984113e419015026","https://github.com/StableLib/stablelib/releases/tag/@stablelib/cbor@2.0.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-106448","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-106448","identifiers":["CVE-2026-106448"]},"retained":false,"historicalAffected":[]},{"revision":"137a7cfda79743e68623e637779e0fc4","observedAt":"2026-11-11T05:32:21.182+00:00","statement":{"source":"euvd","id":"EUVD-2026-93973","aliases":["CVE-2026-106448"],"title":"StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key n…","description":"StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key named __proto__ invokes the inherited prototype setter instead of creating an ordinary own property, allowing the decoded object's prototype to contain attacker-controlled authorization or feature-flag values. Downstream code that trusts normal property lookup or merges the decoded object can therefore make security-sensitive decisions using inherited attacker data. This issue is fixed in version 2.0.4.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","score":8.9,"severity":null}],"references":["https://github.com/StableLib/stablelib/security/advisories/GHSA-w48f-fwg7-ww6p","https://github.com/StableLib/stablelib/commit/0f153a63b7552a0e8721f640984113e419015026","https://github.com/StableLib/stablelib/releases/tag/@stablelib/cbor@2.0.4"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-93973","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 6, 2026, 7:45:02 PM","dateUpdated":"Oct 7, 2026, 5:07:38 PM"},"relatedAdvisories":[],"note":"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."},"key":"euvd:EUVD-2026-93973","identifiers":["EUVD-2026-93973","CVE-2026-106448"]},"retained":false,"historicalAffected":[]},{"revision":"5a482b8e94ff4a8bad4fd7b7ffe24b68","observedAt":"2026-10-25T04:17:41.466+00:00","statement":{"source":"nvd","id":"CVE-2026-106448","aliases":[],"title":"StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key n…","description":"StableLib is a stable library of useful TypeScript and JavaScript code. Prior to 2.0.4, the @stablelib/cbor CBOR map decoding path creates ordinary JavaScript objects and assigns attacker-controlled keys with bracket assignment. A map key named __proto__ invokes the inherited prototype setter instead of creating an ordinary own property, allowing the decoded object's prototype to contain attacker-controlled authorization or feature-flag values. Downstream code that trusts normal property lookup or merges the decoded object can therefore make security-sensitive decisions using inherited attacker data. This issue is fixed in version 2.0.4.","state":0,"publishedAt":"2026-10-06T20:17:26.743+00:00","modifiedAt":"2026-10-07T17:16:47.727+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/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","score":8.9,"severity":"HIGH"}],"references":["https://github.com/StableLib/stablelib/commit/0f153a63b7552a0e8721f640984113e419015026","https://github.com/StableLib/stablelib/releases/tag/@stablelib/cbor@2.0.4","https://github.com/StableLib/stablelib/security/advisories/GHSA-w48f-fwg7-ww6p"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106448","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-1321"],"productCriteria":[],"sourceDates":{"published":"2026-10-06T20:17:26.743","lastModified":"2026-10-07T17:16:47.727"},"relatedAdvisories":[],"note":"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."},"key":"nvd:CVE-2026-106448","identifiers":["CVE-2026-106448"]},"retained":false,"historicalAffected":[]},{"revision":"dc8cd245711343179b70bbc2b0d8d7e7","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-w48f-fwg7-ww6p","aliases":["CVE-2026-106448"],"title":"@stablelib/cbor: Prototype poisoning via `__proto__` map keys in CBOR decoding","description":"### Summary\n\n`@stablelib/cbor` decodes CBOR maps into ordinary JavaScript objects and assigns attacker-controlled keys directly onto those objects. A CBOR map key named `__proto__` therefore changes the prototype of the decoded object instead of becoming an ordinary data property.\n\n### Details\n\nThe decoder builds map results with a plain `{}` and then stores attacker-controlled keys using bracket assignment.\n\nThat is unsafe for special property names. In JavaScript, assigning to `obj[\"__proto__\"]` on a normal object does not create a plain own property. It invokes the built-in `__proto__` setter and replaces the object’s prototype if the supplied value is an object or `null`.\n\nAs a result, a CBOR payload containing a map entry like:\n\n* key: `\"__proto__\"`\n* value: `{ isAdmin: true }`\n\ndoes not decode to an object with an own property called `__proto__`. It decodes to an object whose prototype is now attacker-controlled. Any code that later reads properties through normal lookup will see inherited attacker-supplied values.\n\n### PoC\n\n```js\nimport { decode } from \"@stablelib/cbor\";\n\n// CBOR:\n// {\n//   \"__proto__\": { \"isAdmin\": true }\n// }\n//\n// a1                    map(1)\n//   69                  text(9)\n//     \"__proto__\"\n//   a1                  map(1)\n//     67                text(7)\n//       \"isAdmin\"\n//     f5                true\n\nconst payload = new Uint8Array([\n  0xa1,\n  0x69, 0x5f, 0x5f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x5f, 0x5f,\n  0xa1,\n  0x67, 0x69, 0x73, 0x41, 0x64, 0x6d, 0x69, 0x6e,\n  0xf5\n]);\n\nconst obj = decode(payload);\n\nconsole.log(Object.hasOwn(obj, \"isAdmin\")); // false\nconsole.log(obj.isAdmin);                   // true\nconsole.log(Object.getPrototypeOf(obj).isAdmin); // true\n```\n\n### Impact\n\nAny application that decodes untrusted CBOR into JavaScript objects can receive objects with attacker-controlled prototypes.\n\nIn practice, that can corrupt configuration objects, influence authorization checks, alter feature flags, and break application logic that relies on normal property lookup instead of strict own-property checks. If the decoded object is later merged into other objects, the impact can spread further.\n\n### Solution\n\nUpgrade to version 2.0.4.","state":0,"publishedAt":"2026-04-04T04:24:27+00:00","modifiedAt":"2026-10-07T10:56:10.1816491+00:00","affected":[{"ecosystem":"npm","name":"@stablelib/cbor","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.0.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/StableLib/stablelib/security/advisories/GHSA-w48f-fwg7-ww6p","https://github.com/StableLib/stablelib/commit/0f153a63b7552a0e8721f640984113e419015026","https://github.com/StableLib/stablelib"],"sourceUrl":"https://github.com/advisories/GHSA-w48f-fwg7-ww6p","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-w48f-fwg7-ww6p","identifiers":["GHSA-w48f-fwg7-ww6p","CVE-2026-106448"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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