CVE-2026-12330

Incorrect boundary conditions in the Internationalization component

State: Published
Severity: 5.4 Medium
Published: Jun 16, 2026
Updated: Jun 16, 2026
Reserved: Jun 15, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N	CISA-ADP

Weaknesses

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

Affected Products

Product	Versions
FirefoxMozilla	115.37 through 115.*Not affected 140.12 and laterNot affected
ThunderbirdMozilla	140.12 and laterNot affected

References

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

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