CVE-2026-74940
CRITICAL severity · CVSS 9.8 · Use-after-free
9.8CVSS CRITICAL
Summary
Use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2026-74/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-75/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-76/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-77/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-78/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-79/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-80/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2054842