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. Attackers can pass [__proto__] or [constructor.prototype] table headers or __proto__.x dotted keys to parse() to pollute all objects, causing denial of service or authorization bypass.
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Affected Vendors & Products
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History
Mon, 26 Oct 2026 18:30:00 +0000
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ssvc
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Tue, 13 Oct 2026 07:45:00 +0000
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Gin-quin
Gin-quin fast-toml |
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| Vendors & Products |
Gin-quin
Gin-quin fast-toml |
Mon, 12 Oct 2026 21:00:00 +0000
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| Description | 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. Attackers can pass [__proto__] or [constructor.prototype] table headers or __proto__.x dotted keys to parse() to pollute all objects, causing denial of service or authorization bypass. | |
| Title | fast-toml through 0.5.4 Prototype Pollution via __proto__ Keys in Parsed TOML | |
| Weaknesses | CWE-1321 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-12T20:55:05.966Z
Updated: 2026-10-26T17:37:12.265Z
Reserved: 2026-10-12T19:37:38.614Z
Link: CVE-2021-48012
Updated: 2026-10-26T17:36:18.162Z
Status : Deferred
Published: 2026-10-12T21:17:06.057
Modified: 2026-10-26T18:17:04.217
Link: CVE-2021-48012
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