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[USN-8377-1] Template-Toolkit vulnerability

Posted on 03 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8377-1
June 03, 2026

libtemplate-perl vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Template-Toolkit could allow arbitrary HTML and JavaScript to be injected
into generated output.

Software Description:
- libtemplate-perl: template processing system in Perl

Details:

It was discovered that Template-Toolkit did not properly escape single
quotes in the html_filter function of Template::Plugin::HTML. An attacker
could possibly use this issue to inject arbitrary HTML and JavaScript into
generated output.

Update instructions:

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

Ubuntu 26.04 LTS
libtemplate-perl 3.102-1ubuntu0.1

Ubuntu 25.10
libtemplate-perl 2.27-1ubuntu0.25.10.1

Ubuntu 24.04 LTS
libtemplate-perl 2.27-1ubuntu0.24.04.1

Ubuntu 22.04 LTS
libtemplate-perl 2.27-1ubuntu0.22.04.1

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

References:
https://ubuntu.com/security/notices/USN-8377-1
CVE-2026-5090

Package Information:
https://launchpad.net/ubuntu/+source/libtemplate-perl/3.102-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libtemplate-perl/2.27-1ubuntu0.25.10.1
https://launchpad.net/ubuntu/+source/libtemplate-perl/2.27-1ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/libtemplate-perl/2.27-1ubuntu0.22.04.1

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