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[USN-8416-1] Go Networking vulnerability

Posted on 09 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8416-1
June 09, 2026

golang-golang-x-net-dev vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

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.

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

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