Memory Safety Bug in Firefox ESR Product by Mozilla
CVE-2026-12329

Currently unrated

Key Information:

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

What is CVE-2026-12329?

A memory safety bug in Firefox ESR could allow for potential exploitation by attackers. This vulnerability was addressed in version 140.12, enhancing the product's overall security. Users are encouraged to update to avoid exposure.

Affected Version(s)

Firefox 140.12

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2044738

https://www.mozilla.org/security/advisories/mfsa2026-58/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

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

Credit

Michael Froman

CVE-2026-12329 Data

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