UnratedRed Hat & Ubuntu Linux

pyOpenSSL vulnerability

USN-8335-1 Published May 28, 2026

CVE-2026-27448

Affected products & platforms

Red Hat & Ubuntu LinuxUnclassified

Summary

It was discovered that pyOpenSSL incorrectly handled exceptions in the tlsext_servername callback. This could result in connections being accepted after an exception, contrary to expectations. Affected Ubuntu releases: 20.04, 18.04, 16.04. CVEs: CVE-2026-27448.

Affected versions

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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