CVE-2026-84120
Unknown
Last modified
CVE-2026-84120 is a vulnerability of currently unknown severity. Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2..
Description
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Received
Frequently Asked Questions
What is CVE-2026-84120?
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, and Firefox ESR 153.2.
How severe is CVE-2026-84120?
Severity scoring for CVE-2026-84120 is pending analysis.
How do I fix CVE-2026-84120?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-8410Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Requ…8.8
- CVE-2026-8411Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Requ…8.8
- CVE-2026-84117Privilege escalation in Firefox for Android. This vulnerabil…
- CVE-2026-84118Use-after-free in the JavaScript: GC component. This vulnera…
- CVE-2026-84119Sandbox escape due to use-after-free in the DOM: Navigation …
- CVE-2026-8412Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Requ…8.8
- CVE-2026-84121Sandbox escape due to use-after-free in the DOM: Security co…
- CVE-2026-84122Use-after-free in the Audio/Video component. This vulnerabil…
- CVE-2026-84123Privilege escalation due to use-after-free in the Graphics: …
- CVE-2026-84124Use-after-free in the DOM: Core & HTML component. This vulne…
- CVE-2026-84125Use-after-free in the DOM: Core & HTML component. This vulne…
- CVE-2026-84126Incorrect boundary conditions in the Layout: Grid component.…
Are you affected by CVE-2026-84120?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST