CVE-2026-84121 in Firefox

Resumen

por MITRE • 2026-09-01

Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.

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• Responsable: Mozilla
• Reservar: 2026-09-01
• Divulgación: 2026-09-01
• Moderación: aceptado
• Artículo: VDB-397601
• CPE: listo
• CWE: CWE-416 (confirmado)
• CVSS: 6.3 (VulDB)
• EPSS: 0.00000
• KEV: no
• Actividades: muy bajo
• Sector: Finance, Government, ...

Fuentes

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-84121
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84121
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-84121/