Memory Safety Vulnerability in Firefox by Mozilla
CVE-2026-12290

8.1HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
16 June 2026

What is CVE-2026-12290?

A memory safety issue was identified in Firefox, which could allow malicious actors to execute arbitrary code. This vulnerability has been addressed in the latest updates for Firefox, and users are encouraged to upgrade to the patched versions—Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37—to mitigate potential risks. For additional information, users can refer to Mozilla's security advisories.

Affected Version(s)

Firefox 115.37

Firefox 140.12

Firefox 152

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2024852
https://www.mozilla.org/security/advisories/mfsa2026-57/
https://www.mozilla.org/security/advisories/mfsa2026-58/

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

jayjayjazz
.