CVE-2026-4691

CriticalCVSS 9.8/10Last 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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416CWE-825

Affected software

No affected versions have been published.

Timeline

Published
Mar 24, 2026
Last modified
Jul 15, 2026
NVD status
Modified

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CVE-2026-4691: Critical severity, CVSS 9.8 | Vulnix