Medium6.1Red Hat & Ubuntu Linux
Memory safety bug fixed in Thunderbird ESR 140.12
CVE-2026-12306 Published Jun 16, 2026
CVE-2026-12306
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Memory safety bug fixed in Thunderbird ESR 140.12. Red Hat rates this moderate (CVSS 6.1). Weakness: CWE-787. Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:29940 — update the affected packages (`sudo dnf update`).
Affected versions
- firefox-0:140.12.0-1.el9_8
- firefox-0:140.12.0-1.el8_10
- thunderbird-0:140.12.0-1.el8_10
- firefox-0:140.12.0-1.el10_2
- thunderbird-0:140.12.0-1.el10_2
- thunderbird-0:140.12.0-1.el9_8
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
Fixed versions
- RHSA-2026:29940
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-2026:29940 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 6 hours ago·verify at source
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