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[USN-8883-1] Go vulnerability

Posted on 06 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8883-1
October 06, 2026

golang-1.18, golang-1.21, golang-1.24 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS

Summary:

Go could allow unintended access to network services.

Software Description:
- golang-1.18: Go programming language compiler
- golang-1.21: Go programming language compiler
- golang-1.24: Go programming language compiler

Details:

It was discovered that the Go x/net/idna package incorrectly handled
certain Punycode-encoded labels that decoded to ASCII-only labels. An
attacker could possibly use this issue to bypass hostname-based access
controls and escalate privileges.

Update instructions:

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

Ubuntu 22.04 LTS
golang-1.18 1.18.1-1ubuntu1.3
golang-1.18-go 1.18.1-1ubuntu1.3
golang-1.18-src 1.18.1-1ubuntu1.3
golang-1.21 1.21.1-1~ubuntu22.04.4
golang-1.21-go 1.21.1-1~ubuntu22.04.4
golang-1.21-src 1.21.1-1~ubuntu22.04.4
golang-1.24 1.24.13-2~22.04.2
golang-1.24-go 1.24.13-2~22.04.2
golang-1.24-src 1.24.13-2~22.04.2

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

References:
https://ubuntu.com/security/notices/USN-8883-1
CVE-2026-39821

Package Information:
https://launchpad.net/ubuntu/+source/golang-1.18/1.18.1-1ubuntu1.3
https://launchpad.net/ubuntu/+source/golang-1.21/1.21.1-1~ubuntu22.04.4
https://launchpad.net/ubuntu/+source/golang-1.24/1.24.13-2~22.04.2

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