by Kastro
Paper/Archive/CVE-2026-4725

CVE-2026-4725

Mozilla Firefox — Sandbox escape due to use-after-free in the Graphics: Canvas2D component

EPSS 0.3%CVSS 10.0
critical.is priorityof 100
35
CVSS 10.0 (NVD)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 26.2.262 × 205.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory149CNA
Thunderbirdsee advisory149CNA

Scores by source

NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADP9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2017108refmozilla.org/security/advisories/mfsa2026-20refmozilla.org/security/advisories/mfsa2026-23