[USN-7912-2] CUPS vulnerability

[noreply+usn-bot at canonical.com]

==========================================================================
Ubuntu Security Notice USN-7912-2
December 04, 2025

cups vulnerability
==========================================================================

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

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

Summary:

CUPS could be made to stop responding if it received specially crafted
network traffic.

Software Description:
- cups: Common UNIX Printing System(tm)

Details:

USN-7912-1 fixed vulnerabilities in CUPS. This update provides the
corresponding update for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu
20.04 LTS.

Original advisory details:

 Johannes Meixner and Paul Zirnik discovered that CUPS incorrectly handled
 clients that send messages slowly. A remote attacker could possibly use
 this issue to cause CUPS to stop responding, resulting in a denial of
 service. (CVE-2025-58436)

 In addition, this update fixes a regression introduced in USN-7897-1 which
 resulted in certain invalid configuration file directives to cause the
 CUPS daemon to fail to start.

Update instructions:

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

Ubuntu 20.04 LTS
  cups                            2.3.1-9ubuntu1.9+esm4
                                  Available with Ubuntu Pro
  cups-daemon                     2.3.1-9ubuntu1.9+esm4
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  cups                            2.2.7-1ubuntu2.10+esm10
                                  Available with Ubuntu Pro
  cups-daemon                     2.2.7-1ubuntu2.10+esm10
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  cups                            2.1.3-4ubuntu0.11+esm12
                                  Available with Ubuntu Pro
  cups-daemon                     2.1.3-4ubuntu0.11+esm12
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7912-2
  https://ubuntu.com/security/notices/USN-7912-1
  CVE-2025-58436, https://launchpad.net/bugs/2133207
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