[USN-7912-1] CUPS vulnerability

[noreply+usn-bot at canonical.com]

==========================================================================
Ubuntu Security Notice USN-7912-1
December 04, 2025

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

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

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 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:

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 25.10
  cups                            2.4.12-0ubuntu3.5
  cups-daemon                     2.4.12-0ubuntu3.5

Ubuntu 25.04
  cups                            2.4.12-0ubuntu1.6
  cups-daemon                     2.4.12-0ubuntu1.6

Ubuntu 24.04 LTS
  cups                            2.4.7-1.2ubuntu7.9
  cups-daemon                     2.4.7-1.2ubuntu7.9

Ubuntu 22.04 LTS
  cups                            2.4.1op1-1ubuntu4.16
  cups-daemon                     2.4.1op1-1ubuntu4.16

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

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

Package Information:
  https://launchpad.net/ubuntu/+source/cups/2.4.12-0ubuntu3.5
  https://launchpad.net/ubuntu/+source/cups/2.4.12-0ubuntu1.6
  https://launchpad.net/ubuntu/+source/cups/2.4.7-1.2ubuntu7.9
  https://launchpad.net/ubuntu/+source/cups/2.4.1op1-1ubuntu4.16
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