Use After Free in Mozilla Firefox
CVE-2026-8090
Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.
Vulnerability class: Use-After-Free
EPSS: 0.000 (6.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Mozilla Firefox — versions 115.35.2, 140.10.2, 150.0.2
- Mozilla Thunderbird — versions 140.10.2, 150.0.2
Weakness classification (CWE)
References
- security@mozilla.org (Permissions Required)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-8090?
- CVE-2026-8090 is a high-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 7.3/10. Published 2026-05-07.
- How severe is CVE-2026-8090?
- High severity. CVSS v3 base score is 7.3 out of 10.