by Kastro
Paper/Archive/CVE-2026-4715

CVE-2026-4715

Mozilla Firefox — Uninitialized memory in the Graphics: Canvas2D component

EPSS 0.4%CVSS 9.1
critical.is priorityof 100
35
CVSS 9.1 (ADP, NVD agree)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 38.9.389 × 207.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory140.9CNA
Thunderbirdsee advisory140.9CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refbugzilla.mozilla.org/show_bug.cgi?id=2018405refmozilla.org/security/advisories/mfsa2026-20refmozilla.org/security/advisories/mfsa2026-22refmozilla.org/security/advisories/mfsa2026-23refmozilla.org/security/advisories/mfsa2026-24