CVE-2026-16350 Mozilla CVE debrief

Who should care

Users of Firefox, Firefox ESR, and Thunderbird should apply updates to prevent exploitation of this critical vulnerability. System administrators and security teams responsible for managing these products should prioritize patching. Additionally, developers and testers working with these products should be aware of the vulnerability and its potential impact.

Technical summary

CVE-2026-16350 is a critical vulnerability caused by incorrect boundary conditions in the Audio/Video: cubeb component. It was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13. This vulnerability could potentially allow attackers to execute arbitrary code or cause a denial-of-service condition. Users should review their deployments and apply updates as necessary.

Defensive priority

High

Recommended defensive actions

• Apply Firefox 153 or later
• Apply Firefox ESR 115.38 or later
• Apply Firefox ESR 140.13 or later
• Apply Thunderbird 153 or later
• Apply Thunderbird 140.13 or later
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record for CVE-2026-16350 was published on 2026-07-21T13:17:03.470Z and has not been modified since then. The vulnerability was fixed in multiple Mozilla products. Users should verify their deployments and apply updates accordingly. Evidence is limited to CVE and NVD details.

Official resources