CVE-2026-8090
HIGHCVSS 7.3/10EPSS 0.32%
Last modified
CVE-2026-8090 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.. EPSS estimates a 0.32% chance of exploitation in the next 30 days.
Description
Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 115.35.2 |
| Mozilla | Firefox | < 150.0.2 |
| Mozilla | Firefox | >= 128.0, < 140.10.2 |
| Mozilla | Thunderbird | < 140.10.2 |
| Mozilla | Thunderbird | < 150.0.2 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2034352Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-40/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-41/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-42/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-43/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-44/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-8090?
Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.
How severe is CVE-2026-8090?
CVE-2026-8090 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.
How do I fix CVE-2026-8090?
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.
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Are you affected by CVE-2026-8090?
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Scan your code nowSource: NVD / NIST