CVE-2026-8949
HIGH severity · CVSS 7.5 · Integer overflow
7.5CVSS HIGH
Summary
Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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/mfsa2026-46/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-48/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-50/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-51/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1355639