Boundary Condition Flaw in Firefox Web Browser by Mozilla
CVE-2026-12330

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 16 June 2026

What is CVE-2026-12330?

The vulnerability in the Internationalization component of Firefox stems from incorrect boundary conditions that could potentially lead to unexpected behavior or exploitation. This issue has been addressed in Firefox ESR versions 140.12 and 115.37, emphasizing the importance of updating to secure versions. Users are advised to review the update details and apply necessary patches to maintain security.

Affected Version(s)

Firefox 115.37

Firefox 140.12

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/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Jun 16, 2026
Vulnerability Reserved
Jun 15, 2026

Credit

Mozilla Fuzzing Team

CVE-2026-12330 Data

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