CVE-2021-48012
HIGH
NVD
CVSS Score
8.2
Severity
HIGH
Published
Oct 12, 2026
Vendor
unknown
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.