[USN-8519-1] Go Cryptography vulnerabilities

[noreply+usn-bot at canonical.com]

==========================================================================
Ubuntu Security Notice USN-8519-1
July 09, 2026

golang-go.crypto vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Go Cryptography could be made to crash if it received specially crafted
network traffic.

Software Description:
- golang-go.crypto: Supplementary Go cryptography libraries

Details:

Jakub Ciolek and Nicola Murino discovered that Go Cryptography incorrectly
handled SSH agent responses. An attacker could use this to cause a denial
of service. (CVE-2025-47913)

Yuichi Watanabe discovered that Go Cryptography incorrectly handled SSH
key exchanges. An attacker could use this to cause a denial of service.
(CVE-2025-22869)

Update instructions:

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

Ubuntu 25.10
  golang-golang-x-crypto-dev      1:0.25.0-1ubuntu0.1

Ubuntu 24.04 LTS
  golang-golang-x-crypto-dev      1:0.19.0-1ubuntu0.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  golang-golang-x-crypto-dev      1:0.0~git20211202.5770296-1ubuntu0.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  golang-golang-x-crypto-dev      1:0.0~git20200221.2aa609c-1ubuntu0.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  golang-go.crypto-dev            1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm3
                                  Available with Ubuntu Pro
  golang-golang-x-crypto-dev      1:0.0~git20170629.0.5ef0053-2ubuntu0.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  golang-go.crypto-dev            1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm3
                                  Available with Ubuntu Pro
  golang-golang-x-crypto-dev      1:0.0~git20151201.0.7b85b09-2ubuntu0.1~esm3
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-8519-1
  CVE-2025-22869, CVE-2025-47913

Package Information:
  https://launchpad.net/ubuntu/+source/golang-go.crypto/1:0.25.0-1ubuntu0.1
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