CVE-2026-4691
CRITICAL
mozilla
NVD
CVSS Score
9.8
Severity
CRITICAL
Published
Mar 24, 2026
Vendor
mozilla
Description
Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.