Ubuntu alert USN-8405-2 (cups)

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[USN-8405-2] CUPS regression
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Mon, 15 Jun 2026 14:05:30 +0000
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==========================================================================
Ubuntu Security Notice USN-8405-2
June 15, 2026

cups regression
==========================================================================

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:

USN-8405-1 introduced a regression in CUPS

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

Details:

USN-8405-1 fixed vulnerabilities in CUPS. The update introduced a
regression that cause CUPS to crash when parsing certain large printer PPD
files. This update fixes the problem.

Original advisory details:

 Ariel Silver discovered that CUPS incorrectly handled username comparisons
 during authorization checks. A local attacker could possibly use this issue
 to gain unauthorized access to restricted operations. (CVE-2026-27447)

 Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled
 notify-recipient-uri values in the RSS notifier. A remote attacker could
 possibly use this issue to overwrite lp-writable files and cause a denial
 of service. (CVE-2026-34978)

 Jacob Newman discovered that CUPS incorrectly handled filter option strings
 when processing job attributes. An attacker could use this issue to cause
 CUPS to crash, resulting in a denial of service, or possibly execute
 arbitrary code. (CVE-2026-34979)

 Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled
 page-border values in shared PostScript queues. A remote attacker could
 possibly use this issue to execute arbitrary code. (CVE-2026-34980)

 Asim Viladi Oglu Manizada discovered that CUPS incorrectly handled
 localhost authentication to attacker-controlled IPP services. A local
 attacker could possibly use this issue to overwrite arbitrary files
 and execute arbitrary code. (CVE-2026-34990)

 Tomer Fichman discovered that CUPS incorrectly handled negative
 job-password-supported values. A local attacker could possibly use this
 issue to cause CUPS to crash, resulting in a denial of service.
 (CVE-2026-39314)

 Tomer Fichman discovered that CUPS incorrectly handled temporary printer
 deletion. An attacker could possibly use this issue to cause CUPS to crash,
 resulting in a denial of service, or to execute arbitrary code.
 (CVE-2026-39316)

 Tomer Fichman discovered that CUPS incorrectly handled certain malformed
 SNMP responses. An attacker could possibly use this issue to obtain
 sensitive information. (CVE-2026-41079)

Update instructions:

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

Ubuntu 26.04 LTS
  cups                            2.4.16-1ubuntu1.3
  cups-daemon                     2.4.16-1ubuntu1.3

Ubuntu 25.10
  cups                            2.4.12-0ubuntu3.10
  cups-daemon                     2.4.12-0ubuntu3.10

Ubuntu 24.04 LTS
  cups                            2.4.7-1.2ubuntu7.14
  cups-daemon                     2.4.7-1.2ubuntu7.14

Ubuntu 22.04 LTS
  cups                            2.4.1op1-1ubuntu4.21
  cups-daemon                     2.4.1op1-1ubuntu4.21

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

References:
  https://ubuntu.com/security/notices/USN-8405-2
  https://ubuntu.com/security/notices/USN-8405-1
  https://launchpad.net/bugs/2156339

Package Information:
  https://launchpad.net/ubuntu/+source/cups/2.4.16-1ubuntu1.3
  https://launchpad.net/ubuntu/+source/cups/2.4.12-0ubuntu3.10
  https://launchpad.net/ubuntu/+source/cups/2.4.7-1.2ubuntu...
  https://launchpad.net/ubuntu/+source/cups/2.4.1op1-1ubunt...


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