CVE-2026-0889: Denial-of-service in the DOM: Service Workers component
Denial-of-service in the DOM: Service Workers component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 147 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 147 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 147
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2026-0889?
CVE-2026-0889 is classified as a denial-of-service vulnerability in Firefox versions earlier than 147.
How do I fix CVE-2026-0889?
To fix CVE-2026-0889, update to Firefox version 147 or later.
What components are affected by CVE-2026-0889?
CVE-2026-0889 specifically affects the Service Workers component of the DOM in Firefox.
What versions of Firefox are vulnerable to CVE-2026-0889?
Firefox versions below 147 are vulnerable to CVE-2026-0889.
Can I still use Firefox if I have CVE-2026-0889?
Using an affected version of Firefox may expose you to denial-of-service risks, so it is recommended to update as soon as possible.