Integer Overflow Vulnerability in Mozilla Firefox Audio/Video Component
CVE-2026-8954

7.5HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
19 May 2026

What is CVE-2026-8954?

An integer overflow vulnerability exists in the Audio/Video component of Mozilla Firefox, which arises due to incorrect boundary conditions. This flaw can lead to unexpected behavior within the application. Mozilla has addressed this issue in Firefox version 151 and in the Extended Support Release (ESR) version 140.11, ensuring safer media handling capabilities.

Affected Version(s)

Firefox 140.11

Firefox 151

Thunderbird 140.11

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2030747
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:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ameen Basha M K
.