CVE-2026-74949
highUse-after-free in the Graphics: Canvas2D component.
Vendor / product: Mozilla — firefox
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
CVSS
8.8
8.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
Timeline (UTC)
Published: 2026-08-18 13:17
Modified: 2026-10-28 17:18
NVD status: Modified
Last synced 13 hours ago
Verified against the source API 2026-10-28 17:38 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
mozilla / firefox <140.14.0, ≥141.0.0 <153.1.0
mozilla / thunderbird <140.14.0, ≥141.0 <153.1.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-74/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-76/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-77/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-78/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-79/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-80/
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2060245 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-74/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-76/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-77/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-78/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-79/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-80/ security@mozilla.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-28 17:38 UTC · record ↗