High8.8Red Hat & Ubuntu Linux
Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2
CVE-2026-5734 Published Apr 7, 2026
CVE-2026-5734
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2. Red Hat rates this important (CVSS 8.8). Weakness: CWE-787. Affected package(s): thunderbird, firefox. Resolved in Red Hat advisory RHSA-2026:11805 — update the affected packages (`sudo dnf update`).
Affected versions
- thunderbird-0:140.9.1-1.el8_6
- thunderbird-0:140.9.1-1.el10_0
- thunderbird-0:140.9.1-1.el9_6
- thunderbird-0:140.9.1-1.el8_4
- thunderbird-0:140.9.1-1.el9_4
- thunderbird-0:140.9.1-1.el9_2
- thunderbird-0:140.9.1-1.el9_0
- firefox-0:140.9.1-1.el8_4
- firefox-0:140.9.1-1.el9_4
- firefox-0:140.9.1-1.el8_6
- firefox-0:140.9.1-2.el7_9
- firefox-0:140.9.1-1.el9_6
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
Fixed versions
- RHSA-2026:11805
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:11805 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
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