CVE-2026-0889
HIGHCVSS 7.5/10EPSS 0.54%
Last modified
CVE-2026-0889 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Denial-of-service in the DOM: Service Workers component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.. EPSS estimates a 0.54% chance of exploitation in the next 30 days.
Description
Denial-of-service in the DOM: Service Workers component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 147.0 |
| Mozilla | Thunderbird | < 147.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1999084Exploit, Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-01/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-04/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-0889?
Denial-of-service in the DOM: Service Workers component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
How severe is CVE-2026-0889?
CVE-2026-0889 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.
How do I fix CVE-2026-0889?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2026-0889?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST