HIGH

CVE-2021-48012

CVSS v3

8.2

HIGH

EPSS Score

—

exploit probability

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2021-48012 yet.

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Published: 2026-10-12
Last Modified: 2026-10-12

Frequently asked questions

What is CVE-2021-48012?

Is CVE-2021-48012 actively exploited?

Active exploitation of CVE-2021-48012 has not been confirmed.

What is the CVSS score for CVE-2021-48012?

CVE-2021-48012 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L.

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