Denial-of-Service Vulnerability in Firefox Affected by Service Workers Component
CVE-2026-0889

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
13 January 2026

What is CVE-2026-0889?

A denial-of-service vulnerability exists within the Service Workers component of Firefox, affecting versions prior to 147. This weakness could be exploited to cause disruptions in service, impacting the performance and availability of the browser for end users. It is crucial for users and administrators to be aware of this vulnerability to take necessary precautions and update to a secure version of Firefox.

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Affected Version(s)

Firefox < 147

Thunderbird < 147

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1999084
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-04/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Elysee Franchuk, Caleb Lerch
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