CVE-2026-109749
MEDIUMCVSS 5.4/10
Last modified
CVE-2026-109749 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Thunderbird 158..
Description
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-109749?
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
How severe is CVE-2026-109749?
CVE-2026-109749 has a CVSS score of 5.4/10 (MEDIUM severity).
How do I fix CVE-2026-109749?
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-2026-109743Privilege escalation in the Panning and Zooming component. T…8.8
- CVE-2026-109744Other issue in the DOM: File component. This vulnerability w…
- CVE-2026-109745Sandbox escape due to uninitialized memory in the DOM: Web S…
- CVE-2026-109746Mitigation bypass in the DOM: Security component. This vulne…
- CVE-2026-109747Other issue in the Address Bar component. This vulnerability…
- CVE-2026-109748Use-after-free in the JavaScript: WebAssembly component. Thi…5.4
- CVE-2026-10975Use after free in WebRTC in Google Chrome prior to 149.0.782…8.8
- CVE-2026-109750Site isolation issue in the DOM: Web Authentication componen…
- CVE-2026-109751Information disclosure in the Networking component. This vul…4.3
- CVE-2026-109752Use-after-free in the DOM: Workers component. This vulnerabi…5.4
- CVE-2026-109753Incorrect boundary conditions in the Layout component. This …8.1
- CVE-2026-109754Incorrect boundary conditions in the DOM: Editor component. …
Are you affected by CVE-2026-109749?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST