CVE-2026-12291

Description

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.

References

https://www.mozilla.org/security/advisories/mfsa2026-61/

https://www.mozilla.org/security/advisories/mfsa2026-60/

https://www.mozilla.org/security/advisories/mfsa2026-59/

https://www.mozilla.org/security/advisories/mfsa2026-58/

https://www.mozilla.org/security/advisories/mfsa2026-57/

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12291.json

https://bugzilla.redhat.com/show_bug.cgi?id=2489244

https://bugzilla.mozilla.org/show_bug.cgi?id=2036929

https://access.redhat.com/security/cve/CVE-2026-12291

https://access.redhat.com/errata/RHSA-2026:36103

https://access.redhat.com/errata/RHSA-2026:36102

https://access.redhat.com/errata/RHSA-2026:36101

https://access.redhat.com/errata/RHSA-2026:36100

https://access.redhat.com/errata/RHSA-2026:33445

https://access.redhat.com/errata/RHSA-2026:30846

https://access.redhat.com/errata/RHSA-2026:29940

https://access.redhat.com/errata/RHSA-2026:27734

https://access.redhat.com/errata/RHSA-2026:27733

https://access.redhat.com/errata/RHSA-2026:27717

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

EPSS