CVE-2026-4729criticalCWE-120 CWE-825

CVE-2026-4729: fallo crítico en Mozilla Firefox

Memory safety bugs fixed in Firefox 149 and Thunderbird 149

Publicada el 24 mar 2026 · Actualizada el 15 jul 2026

Seguir esta CVE + Monitorear Firefox + Monitorear Thunderbird

Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.

28Vexday Risk Score

Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.

ssvc Trackcvss 9.8epss 0.3%

Memory safety bugs present in Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

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

Productos afectados

Mozilla · Firefox Mozilla · Thunderbird

CVEs relacionadas — Mozilla Firefox

En el mismo producto, de las más peligrosas a las menos.

CVE-2016-9079HIGHCVE-2016-9079EPSS 87.4%KEV CVE-2019-11708CRITICALCVE-2019-11708EPSS 55.9%KEV CVE-2019-17026HIGHCVE-2019-17026EPSS 46.3%KEV CVE-2019-11707HIGHCVE-2019-11707EPSS 38.0%KEV CVE-2024-9680CRITICALCVE-2024-9680EPSS 23.2%KEV CVE-2022-26485HIGHCVE-2022-26485EPSS 14.3%KEV

Referencias

https://access.redhat.com/security/cve/CVE-2026-4729 https://bugzilla.mozilla.org/buglist.cgi?bug_id=1944033%2C1997282%2C2009213%2C2011412%2C2021925%2C2022034 https://bugzilla.redhat.com/show_bug.cgi?id=2450745 https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4729.json https://www.mozilla.org/security/advisories/mfsa2026-20/https://www.mozilla.org/security/advisories/mfsa2026-23/