by Kastro
Paper/Archive/CVE-2026-2799

CVE-2026-2799

Mozilla Firefox — Use-after-free in the DOM: Core & HTML component

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 45.2.452 × 209.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory148CNA
Thunderbirdsee advisory148CNA
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 10see advisory–redhat-SADP
Red Hat Enterprise Linux 6see advisory–redhat-SADP
Red Hat Enterprise Linux 6see advisory–redhat-SADP
Red Hat Enterprise Linux 7see advisory–redhat-SADP
Red Hat Enterprise Linux 7see advisory–redhat-SADP
Red Hat Enterprise Linux 8see advisory–redhat-SADP
Red Hat Enterprise Linux 8see advisory–redhat-SADP

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADP8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
redhat-SADP (CNA)7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2014551refmozilla.org/security/advisories/mfsa2026-13refmozilla.org/security/advisories/mfsa2026-16refaccess.redhat.com/security/cve/CVE-2026-2799refbugzilla.redhat.com/show_bug.cgi?id=2442303refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2799.json