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CVE-2021-48012

8.2, high

Gin-Quin fast-toml Prototype Pollution Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.2, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 34.2% of scored CVEs
Exploitation
No public evidence
Published
12 Oct 20265 days ago

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.

Details

Vendor
Gin-Quin
Product
fast-toml
Weakness
CWE-1321 (opens in a new tab)
Status
Deferred
Updated
16 Oct 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

References 4

Patches and fixes 1

Other references 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Beyond this page

Is CVE-2021-48012 in your network?

This page tells you how dangerous CVE-2021-48012 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.