High8.2Red Hat & Ubuntu Linux
Out of bounds read in IMAP parsing
CVE-2026-4371 Published Mar 24, 2026
CVE-2026-4371
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Out of bounds read in IMAP parsing. Red Hat rates this important (CVSS 8.2). Weakness: CWE-130. Affected package(s): thunderbird. Resolved in Red Hat advisory RHSA-2026:8286 — update the affected packages (`sudo dnf update`).
Affected versions
- thunderbird-0:140.9.0-1.el8_2
- thunderbird-0:140.9.0-1.el9_0
- thunderbird-0:140.9.0-1.el8_4
- thunderbird-0:140.9.0-1.el9_2
- thunderbird-0:140.9.0-1.el10_1
- thunderbird-0:140.9.0-1.el8_6
- thunderbird-0:140.9.0-1.el10_0
- thunderbird-0:140.9.0-1.el9_4
- thunderbird-0:140.9.0-1.el8_8
- thunderbird-0:140.9.0-1.el9_7
- thunderbird-0:140.9.0-1.el9_6
- thunderbird-0:140.9.0-1.el8_10
Official advisory · high-confidence parse· fetched 5 hours ago·verify at source
Fixed versions
- RHSA-2026:8286
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-2026:8286 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 5 hours ago·verify at source
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