UnratedRed Hat & Ubuntu Linux
Go Networking vulnerability
USN-8416-1 Published Jun 9, 2026
CVE-2026-39821
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
It was discovered that Go Networking incorrectly handled certain Punycode-encoded labels in the idna package. An attacker could possibly use this issue to bypass hostname-based access restrictions. Affected Ubuntu releases: 20.04, 18.04. CVEs: CVE-2026-39821.
Affected versions
- Ubuntu 20.04
- Ubuntu 18.04
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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