UnratedRed Hat & Ubuntu Linux
Undertow vulnerability
USN-8144-1 Published Apr 2, 2026
CVE-2025-12543
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
It was discovered that Undertow incorrectly validated the Host header in incoming HTTP requests. A remote attacker could possibly use this issue to gain unintended access to user sessions. Affected Ubuntu releases: 24.04, 22.04, 20.04, 18.04, 16.04. CVEs: CVE-2025-12543.
Affected versions
- Ubuntu 24.04
- Ubuntu 22.04
- Ubuntu 20.04
- Ubuntu 18.04
- Ubuntu 16.04
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Apply available updates: `sudo apt update && sudo apt upgrade` (a standard system update installs the fix).
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
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