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Cve-2026-4691

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critical advisory

Use-After-Free Vulnerability in Firefox, ESR, and Thunderbird CSS Parsing (CVE-2026-4691)

A use-after-free vulnerability (CVE-2026-4691) in the CSS Parsing and Computation component affects Firefox versions prior to 149, Firefox ESR versions prior to 115.34 and 140.9, and Thunderbird versions prior to 149 and 140.9, potentially leading to arbitrary code execution.

Firefox +2 cve-2026-4691 use-after-free thunderbird
2r 3t