CVE-2021-48012 — fast-toml through 0.5.4 Prototype Pollution via __proto__ Keys in Parsed TOML
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 prot…
Published: 2026-10-12 · CVSS: 8.8 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7