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Weakness (CWE) CWE-1321 Improperly Controlled Modification of Object Prototype Attributes 1

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TI-2021-22760 CVE-2021-48012 · GHSA-qqfj-vf92-g76j

Prototype pollution in fast-toml via proto keys in parsed TOML

Priority MEDIUM 44

fast-toml through 0.5.4 contains a prototype pollution vulnerability that allows attackers to modify Object.prototype by supplying TOML containing __proto__, constructor or prototype key segments.

CVSS 4.0HIGH 8.8· Network · No auth · No interaction · EPSS 0.00414 · Published 2026-10-12 · No fix listed CWE-1321

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Vulnerabilities

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Prototype pollution in fast-toml via __proto__ keys in parsed TOML

Prototype pollution in fast-toml via proto keys in parsed TOML