CVE-2026-0889

HIGH

Firefox < 147.0 - Denial of Service in DOM Service Workers

Title source: llm

Denial-of-service in the DOM: Service Workers component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

Core 3

Core References

Exploit, Issue Tracking, Vendor Advisory

Vendor Advisory

Vendor Advisory

CVSS v3 7.5

EPSS 0.0054

EPSS Percentile 40.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

CWE

CWE-400

Status published

Products (4)

mozilla/firefox < 147.0

Mozilla/Firefox 147

mozilla/thunderbird < 147.0

Mozilla/Thunderbird 147

Published Jan 13, 2026

Tracked Since Feb 18, 2026