{"api_version":"1","generated_at":"2026-10-06T21:46:39+00:00","cve":"CVE-2026-106448","urls":{"html":"https://cve.report/CVE-2026-106448","api":"https://cve.report/api/cve/CVE-2026-106448.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-106448","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-106448"},"summary":{"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. 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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.","Type":"Description","Title":"StableLib: Prototype poisoning via `__proto__` map keys in CBOR "}]}}}