Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://www.mozilla.org/security/advisories/mfsa2026-58/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-59/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-61/ Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.4 · mozillaNVD modified 2026-10-26 12:10
Affected (CPE criteria) 2
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
References 4
- https://bugzilla.mozilla.org/show_bug.cgi?id=2029326 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-58/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-59/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-61/ Vendor Advisory