CVE-2026-12330

Summary

Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected products we track (2)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Additional information

• NVD record
• https://www.mozilla.org/security/advisories/mfsa2026-58/Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-59/Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-61/Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=2029326