Race Condition in JavaScript GC Component of Firefox
CVE-2026-2802

4.2MEDIUM

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2802?

A race condition has been identified in the JavaScript garbage collection (GC) component of Firefox, impacting versions below 148. This vulnerability may allow attackers to exploit the timing of operations, potentially leading to unexpected behaviors or security breaches. Users of Firefox are advised to update to the latest version to mitigate the risks associated with this vulnerability.

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Affected Version(s)

Firefox < 148

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2011069
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-16/

CVSS V3.1

Score:
4.2
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Gary Kwong
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