Resource exhaustion in Mozilla Firefox
CVE-2026-0889
Denial-of-service in the DOM: Service Workers component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.005 (41.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Mozilla Firefox — versions 147
- Mozilla Thunderbird — versions 147
Weakness classification (CWE)
References
- security@mozilla.org (Exploit, Issue Tracking, Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-0889?
- CVE-2026-0889 is a high-severity vulnerability in Mozilla Firefox, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-01-13.
- How severe is CVE-2026-0889?
- High severity. CVSS v3 base score is 7.5 out of 10.