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[USN-8944-2] ca-certificates update

Posted on 21 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8944-2
October 20, 2026

ca-certificates update
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

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

Software Description:
- ca-certificates: Common CA certificates

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the ca-certificates package contained outdated CA certificates.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.

Update instructions:

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

Ubuntu 20.04 LTS
ca-certificates 20240203~20.04.1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 18.04 LTS
ca-certificates 202402031ubuntu0.18.04.1+esm3
Available with Ubuntu Pro

Ubuntu 16.04 LTS
ca-certificates 202402031~16.04.1~esm3
Available with Ubuntu Pro

Ubuntu 14.04 LTS
ca-certificates 20230311~14.04.1~esm3
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8944-2
https://ubuntu.com/security/notices/USN-8944-1
https://bugs.launchpad.net/bugs/2171507

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