Use-After-Free Vulnerability in Firefox Browser by Mozilla
CVE-2026-2797

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2797?

A use-after-free vulnerability has been identified in the JavaScript garbage collection component of the Firefox browser, impacting all versions prior to 148. This flaw can lead to exploitation opportunities where an attacker may execute arbitrary code, potentially compromising user systems. It is essential for users of affected Firefox versions to apply the latest patches to safeguard their security.

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Affected Version(s)

Firefox < 148

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2013561
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-16/

CVSS V3.1

Score:
8.8
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

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