Integer Overflow Vulnerability in Firefox Audio/Video Playback Component
CVE-2026-16408

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
21 July 2026

What is CVE-2026-16408?

An integer overflow vulnerability in the Audio/Video playback component of Mozilla's Firefox browser could allow attackers to execute arbitrary code. This issue has been addressed in Firefox version 153, ensuring users are encouraged to update to the latest release to mitigate potential risks.

Affected Version(s)

Firefox 153

Thunderbird 153

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2050477
https://www.mozilla.org/security/advisories/mfsa2026-68/
https://www.mozilla.org/security/advisories/mfsa2026-71/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

5up3rh3i
.