CVE-2026-16362 Mozilla CVE debrief

Who should care

Users of Firefox, Firefox ESR, Thunderbird, and other products that utilize the WebRTC: Audio/Video component should be aware of this vulnerability and take steps to update their software. Operators, platform administrators, vulnerability management teams, and security teams should review the affected scope and take necessary actions to mitigate the risk.

Technical summary

The CVE-2026-16362 vulnerability is a use-after-free issue in the WebRTC: Audio/Video component of Firefox, Firefox ESR, and Thunderbird. This type of vulnerability occurs when a program attempts to access memory after it has been freed, which can lead to crashes, data corruption, or potentially allow attackers to execute arbitrary code. The vulnerability was addressed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. Affected product deployments should be reviewed for exposure.

Defensive priority

High

Recommended defensive actions

• Update Firefox to version 153 or later
• Update Firefox ESR to version 140.13 or later
• Update Thunderbird to version 153 or later
• Update Thunderbird to version 140.13 or later
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record was published on 2026-07-21T13:17:04.733Z and was last modified on 2026-07-22T20:16:52.103Z. The NVD entry is currently Undergoing Analysis. References include bug reports and security advisories from Mozilla. The vulnerability affects Firefox, Firefox ESR, and Thunderbird products that utilize the WebRTC: Audio/Video component. Defenders should verify the affected scope and review context. Additional review of related security advisories and bug reports is recommended.

Official resources