High7.5Red Hat & Ubuntu Linux
Other issue in the JavaScript Engine component
CVE-2026-8391 Published May 12, 2026
CVE-2026-8391
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Other issue in the JavaScript Engine component. Red Hat rates this important (CVSS 7.5). Weakness: CWE-475. Affected package(s): thunderbird, firefox. Resolved in Red Hat advisory RHSA-2026:26551 — update the affected packages (`sudo dnf update`).
Affected versions
- 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 5 hours ago·verify at source
Fixed versions
- RHSA-2026:26551
Official advisory · high-confidence parse· fetched 5 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- 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 5 hours ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.