Low [CVE-2026-8962] Mitigation bypass in the DOM: Security component
This low-severity Red Hat Linux advisory covers CVE-2026-8962 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 1.
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Summary
Mitigation bypass in the DOM: Security component. Red Hat rates this low (CVSS 3.4).
Weakness: CWE-358. Affected package(s): thunderbird, firefox.
Resolved in Red Hat advisory RHSA-2026:26551 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 7.
- thunderbird-0:140.11.0-1.el8_8
- firefox-0:140.11.0-1.el9_4
- firefox-0:140.11.0-1.el8_4
- thunderbird-0:140.11.0-1.el9_8
- firefox-0:140.11.0-1.el9_6
- thunderbird-0:140.11.0-1.el10_2
- firefox-0:140.11.0-1.el8_6
- thunderbird-0:140.11.0-1.el8_4
- thunderbird-0:140.11.0-1.el10_0
- thunderbird-0:140.11.0-1.el9_4
- thunderbird-0:140.11.0-1.el8_6
- firefox-0:140.11.0-1.el9_2
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:26551
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:26551 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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