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.
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Fri, 09 Oct 2026 09:15:00 +0000
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| 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. | |
| Title | StableLib: Prototype poisoning via `__proto__` map keys in CBOR decoding | |
| Weaknesses | CWE-1321 | |
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cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-10-06T19:45:02.616Z
Updated: 2026-10-07T17:07:38.703Z
Reserved: 2026-10-06T16:49:40.590Z
Link: CVE-2026-106448
Updated: 2026-10-07T15:27:17.575Z
Status : Awaiting Analysis
Published: 2026-10-06T20:17:26.743
Modified: 2026-10-07T17:16:47.727
Link: CVE-2026-106448
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