Vulnerability in Mozilla Firefox
CVE-2026-2802
Race condition in the JavaScript: GC component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
Vulnerability class: Race Condition
EPSS: 0.001 (3.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.
Affected products
- Mozilla Firefox — versions 148
- Mozilla Thunderbird — versions 148
Weakness classification (CWE)
References
- security@mozilla.org (Permissions Required)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-2802?
- CVE-2026-2802 is a medium-severity vulnerability in Mozilla Firefox, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.2/10. Published 2026-02-24.
- How severe is CVE-2026-2802?
- Medium severity. CVSS v3 base score is 4.2 out of 10.