CVE-2026-12330mediumCWE-119

CVE-2026-12330: medium-severity vulnerability in Mozilla Firefox

Incorrect boundary conditions in the Internationalization component

Published

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.4epss 0.2%
exploitation probability
0.2%top 95% of all CVEs
observed exploitation
nono source reports it
Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Affected products
Mozilla · FirefoxMozilla · Thunderbird
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References
https://bugzilla.mozilla.org/show_bug.cgi?id=2029326https://www.mozilla.org/security/advisories/mfsa2026-58/https://www.mozilla.org/security/advisories/mfsa2026-59/https://www.mozilla.org/security/advisories/mfsa2026-61/