🔐 CVE Alert

CVE-2026-12330

MEDIUM 5.4

Incorrect boundary conditions in the Internationalization component

CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th

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

Vendor mozilla
Product firefox
Ecosystems
Industries
Technology
Published Jun 16, 2026
Last Updated Jun 16, 2026
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Affected Versions

Mozilla / Firefox
All versions affected
Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2029326 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-58/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-59/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-61/

Credits

Mozilla Fuzzing Team