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Ubuntu 20.04 18.04 Go Networking Critical Access USN-8416-1

ubuntu
Calendar Grey June 9, 2026
Dist Ubuntu Esm H88
Update Ubuntu systems to resolve critical Go Networking issues, preventing unauthorized network access.
Go Networking could allow unintended access to network services.

Summary

Go Networking could allow unintended access to network services.

Software Description:

- golang-golang-x-net-dev: Supplementary Go networking development files

Details:

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.

Topics%20covered

Topics Covered

security advisory critical Ubuntu network access golang go networking

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS
  golang-go.net-dev               1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3
                                  Available with Ubuntu Pro
  golang-golang-x-net-dev         1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  golang-go.net-dev               1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3
                                  Available with Ubuntu Pro
  golang-golang-x-net-dev         1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8416-1

CVE-2026-39821

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8416-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu network access golang go networking

Package Information

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