Denial-of-Service Vulnerability in Firefox Web Codecs Component
CVE-2026-8968

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
19 May 2026

What is CVE-2026-8968?

A denial-of-service vulnerability has been identified in the Web Codecs component of Firefox, triggered by an invalid pointer. This issue can lead to service interruption and impact user experience. The vulnerability has been addressed in the updates Firefox 151 and Firefox ESR 140.11, ensuring enhanced security and stability for users.

Affected Version(s)

Firefox 140.11

Firefox 151

Thunderbird 140.11

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2030467
https://www.mozilla.org/security/advisories/mfsa2026-46/
https://www.mozilla.org/security/advisories/mfsa2026-48/

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

Tristan Madani
.