Memory Safety Flaw in Firefox by Mozilla
CVE-2026-12300

Currently unrated

Key Information:

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

What is CVE-2026-12300?

A memory safety vulnerability was identified and addressed in Firefox version 152. It could potentially allow attackers to exploit memory management flaws, leading to unexpected behaviors or exploit scenarios. Users are encouraged to update to the latest version to safeguard against possible risks.

Affected Version(s)

Firefox 152

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1704114

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

Download the Critical Vulnerability Management Cheat Sheet

Timeline

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

Credit

Niklas

CVE-2026-12300 Data

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