CVE-2026-4694
HIGH severity · CVSS 7.5 · Integer overflow
7.5CVSS HIGH
Summary
Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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/mfsa2026-20/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-21/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-22/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-23/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-24/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2018430