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CVE-2021-48012— fast-toml through 0.5.4 Prototype Pollution via __proto__ Keys in Parsed TOML

Quick assessment

Affected
Gin-Quin fast-toml
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

fast-toml 版本 0.5.4 及之前版本存在原型污染漏洞。攻击者可通过提供包含 、 或 键段的 TOML 内容，修改 。攻击者可以向 函数传入 或 这样的表头，或者使用 形式的点号键，从而污染所有对象，可能导致拒绝服务（DoS）或绕过授权控制。

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-48012

Vulnerability Information
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Vulnerability Title
fast-toml through 0.5.4 Prototype Pollution via __proto__ Keys in Parsed TOML
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Gin-Quin fast-toml 0 ~ 0.5.4 -

II. Public POCs for CVE-2021-48012

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III. Intelligence Information for CVE-2021-48012

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Patches & Fixes for CVE-2021-48012 (1)

Proof of Concept for CVE-2021-48012 (1)

Other References for CVE-2021-48012 (2)

IV. Related Vulnerabilities

Same weakness: CWE-1321

V. Comments for CVE-2021-48012

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