Memory Safety Vulnerability in Firefox by Mozilla
CVE-2026-12314

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
16 June 2026

What is CVE-2026-12314?

A memory safety issue identified in Mozilla's Firefox browser has been resolved in version 152 and Firefox ESR 140.12. This vulnerability, if exploited, could lead to unexpected behavior, potentially allowing an attacker to execute arbitrary code. Mozilla has released patches to mitigate this risk, and it is crucial for users to update to the latest versions to ensure their browsing experience remains secure. Regular updates and awareness of known vulnerabilities can significantly enhance user protection.

Affected Version(s)

Firefox 140.12

Firefox 152

Thunderbird 140.12

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2041856
https://www.mozilla.org/security/advisories/mfsa2026-57/
https://www.mozilla.org/security/advisories/mfsa2026-58/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

satyamasd
.