==========================================================================
Ubuntu Security Notice USN-8405-1
June 08, 2026

cups vulnerabilities
==========================================================================

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:

Several security issues were fixed in CUPS.

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

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                            2.4.16-1ubuntu1.2
  cups-daemon                     2.4.16-1ubuntu1.2

Ubuntu 25.10
  cups                            2.4.12-0ubuntu3.9
  cups-daemon                     2.4.12-0ubuntu3.9

Ubuntu 24.04 LTS
  cups                            2.4.7-1.2ubuntu7.13
  cups-daemon                     2.4.7-1.2ubuntu7.13

Ubuntu 22.04 LTS
  cups                            2.4.1op1-1ubuntu4.20
  cups-daemon                     2.4.1op1-1ubuntu4.20

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

References:
  https://ubuntu.com/security/notices/USN-8405-1
  CVE-2026-27447, CVE-2026-34978, CVE-2026-34979, CVE-2026-34980,
  CVE-2026-34990, CVE-2026-39314, CVE-2026-39316, CVE-2026-41079

Package Information:
  https://launchpad.net/ubuntu/+source/cups/2.4.16-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/cups/2.4.12-0ubuntu3.9
  https://launchpad.net/ubuntu/+source/cups/2.4.7-1.2ubuntu7.13
  https://launchpad.net/ubuntu/+source/cups/2.4.1op1-1ubuntu4.20