{"id":"CVE-2026-106448","revision":"4db3a63bf4e74885bd9e580613a515db","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":[]}],"coverage":[]}