CVE-2021-48012
fast-toml through 0.5.4 Prototype Pollution via __proto__ Keys in Parsed TOML
CVSS Score
8.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1321 |
| Vendor | gin-quin |
| Product | fast-toml |
| Published | Oct 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low
Affected Versions
Gin-Quin / fast-toml
0 ≤ 0.5.4
References
Credits
Abdulloh Nuriddinov Asjidkalam gnsehfvlr