{"id":"CVE-2026-106448","title":"StableLib is a stable library of useful TypeScript and JavaScript code","summary":"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 ke…","severity":"high","cvss":8.9,"cvssVector":"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","cwe":["CWE-1321"],"vendor":"StableLib","product":"stablelib","affected":["stablelib < 2.0.4"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T20:17:26.743","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106448","references":[{"url":"https://github.com/StableLib/stablelib/commit/0f153a63b7552a0e8721f640984113e419015026","label":"security-advisories@github.com"},{"url":"https://github.com/StableLib/stablelib/releases/tag/@stablelib/cbor@2.0.4","label":"security-advisories@github.com"},{"url":"https://github.com/StableLib/stablelib/security/advisories/GHSA-w48f-fwg7-ww6p","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"cvssSource":"cna","ingestedAt":"2026-10-06T20:16:42.481Z","slug":"CVE-2026-106448","body":"## Overview\n\nStableLib 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":49,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}