UnratedRed Hat & Ubuntu Linux

Rack::Session vulnerability

USN-8190-1 Published Apr 20, 2026

CVE-2026-39324

Affected products & platforms

Red Hat & Ubuntu LinuxUnclassified

Summary

SeungMyung Lee discovered that Rack::Session did not properly reject cookies upon decryption failure. A remote attacker could use this issue to manipulate session contents and possibly gain unauthorized access. Affected Ubuntu releases: 25.10. CVEs: CVE-2026-39324.

Affected versions

Ubuntu 25.10

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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