CVE-2026-4691

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CVSS 3.1

9.8 critical

EPSS

<1%p40

Published

Mar 24, 2026 (Mar 24, 2026)

Modified

Jul 15, 2026

Description

Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Vendors: mozilla
Products: firefox
Weakness: CWE-416, CWE-825
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.5%)

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