CVE-2026-4691 in Firefox

Sumário

de MITRE • 24/03/2026

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.

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• Responsável: Mozilla
• Reservar: 24/03/2026
• Divulgação: 24/03/2026
• Moderação: aceite
• Entrada: VDB-352738
• CPE: pronto
• CWE: CWE-416 (confirmado)
• CVSS: 9.8 (NVD)
• EPSS: 0.00483
• KEV: não
• Atividades: muito baixo
• Sector: Police, Industry, ...

Fontes

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-4691
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4691
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-4691/