CVE-2026-2447
HIGHCVSS 8.8/10EPSS 0.45%
Last modified
CVE-2026-2447 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.
Description
Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 115.32.1 |
| Mozilla | Firefox | < 147.0.4 |
| Mozilla | Firefox | >= 116.0, < 140.7.1 |
| Mozilla | Thunderbird | < 140.7.2 |
| Mozilla | Thunderbird | >= 141.0, < 147.0.2 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2014390Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-10/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-11/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-2447?
Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.
How severe is CVE-2026-2447?
CVE-2026-2447 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.
How do I fix CVE-2026-2447?
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.
Are you affected by CVE-2026-2447?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST