USN-8944-2: ca-certificates update

Publication date

20 October 2026

Overview

The CA certificates in the ca-certificates package were updated.


Packages

Details

USN-8944-1 updated ca-certificates. This update provides the corresponding
changes for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and
Ubuntu 20.04 LTS by removing the "emSign ECC Root CA - G3" and "Comodo AAA
Services root" CA certificates.

Original advisory details:

This update removes the "emSign ECC Root CA - G3" CA certificate due to
intermediate CA certificates being compromised.

In addition, in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS,
the ca-certificates package contained outdated CA certificates. This
update refreshes the included certificates to those contained in the 2.90
version of the Mozilla certificate authority bundle.

USN-8944-1 updated ca-certificates. This update provides the corresponding
changes for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and
Ubuntu 20.04 LTS by removing the "emSign ECC Root CA - G3" and "Comodo AAA
Services root" CA certificates.

Original advisory details:

This update removes the "emSign ECC Root CA - G3" CA certificate due to
intermediate CA certificates being compromised.

In addition, in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS,
the ca-certificates package contained outdated CA certificates. This
update refreshes the included certificates to those contained in the 2.90
version of the Mozilla certificate authority bundle.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
20.04 LTS focal ca-certificates –  20240203~20.04.1ubuntu0.1~esm2  
18.04 LTS bionic ca-certificates –  202402031ubuntu0.18.04.1+esm3  
16.04 LTS xenial ca-certificates –  202402031~16.04.1~esm3  
14.04 LTS trusty ca-certificates –  20230311~14.04.1~esm3  

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.


Have additional questions?

Talk to a member of the team ›