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[USN-7749-1] Cpanel-JSON-XS vulnerability

Posted on 15 September 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7749-1
September 15, 2025

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

- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Cpanel-JSON-XS could be made to crash if it parsed specially crafted JSON.

Software Description:
- libcpanel-json-xs-perl: module for fast and correct serialising to JSON

Details:

It was discovered that Cpanel-JSON-XS incorrectly handled parsing certain
JSON data. An attacker could possibly use this issue to cause
Cpanel-JSON-XS to crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 25.04
libcpanel-json-xs-perl 4.39-1ubuntu0.1

Ubuntu 24.04 LTS
libcpanel-json-xs-perl 4.37-1ubuntu0.1

Ubuntu 22.04 LTS
libcpanel-json-xs-perl 4.27-1ubuntu0.2

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

References:
https://ubuntu.com/security/notices/USN-7749-1
CVE-2025-40929

Package Information:
https://launchpad.net/ubuntu/+source/libcpanel-json-xs-perl/4.39-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libcpanel-json-xs-perl/4.37-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libcpanel-json-xs-perl/4.27-1ubuntu0.2

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