CVE-2026-12291
Mozilla Firefox, Thunderbird, Red Hat Enterprise Linux 10
Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
- CVSS
- 8.8
- EPSS
- 0.38% 30.9% percentile
- CISA KEV
- Not listed
- Published
- 2026.06.16