CVE-2026-16364
This vulnerability is in the audio and video playback component of certain browsers. It allows attackers to exploit incorrect boundary checks, potentially leading to code execution or data loss. The issue has been fixed in newer releases.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Firefox and Thunderbird users running versions older than 153 are affected.
Real-world impact
An attacker could run malicious code or corrupt data when a user plays a specially crafted media file, compromising the confidentiality or integrity of the system.
Why this severity
The CVSS score of 9.1 reflects that the flaw can be exploited remotely without authentication, with no user interaction, and can compromise both confidentiality and integrity of data.
What to do about it
- 01Upgrade Firefox to version 153 or later.
- 02Upgrade Thunderbird to version 153 or later.
- 03Restart the application.
NVD-referenced vendor advisory
Timeline
- Jul 21, 2026 · 12d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 23, 2026 · 10d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
- Jul 24, 2026 · 9d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- bugzilla.mozilla.org/show_bug.cgipermissions required
- mozilla.org/security/advisories/mfsa202…vendor advisory
- mozilla.org/security/advisories/mfsa202…vendor advisory