Memory Safety Vulnerability in Firefox by Mozilla
CVE-2026-12312

Currently unrated

Key Information:

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

What is CVE-2026-12312?

A memory safety issue was identified in Firefox that could potentially allow for unexpected behavior or exploitation of the software. This vulnerability affects users of Firefox 152 and Firefox ESR 140.12, prompting users to update to the latest versions to ensure their security. Mozilla has addressed this issue in the respective releases, enhancing overall stability and user safety.

Affected Version(s)

Firefox 140.12

Firefox 152

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2040383

https://www.mozilla.org/security/advisories/mfsa2026-57/

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

Rintaro Kawasugi

CVE-2026-12312 Data

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