Argument injection in cups - CVE-2026-105326
Published: October 12, 2026
Vulnerability identifier: #VU154064
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105326
CWE-ID: CWE-88
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute arbitrary code with the privileges of the filter user (lp).
The vulnerability exists due to argument injection in the mailto notifier's pipe_sendmail function in notifier/mailto.c when passing subscription recipient addresses to sendmail. A local user can create a printer subscription with a crafted notify-recipient-uri that causes sendmail to load an attacker-controlled configuration file to execute arbitrary code with the privileges of the filter user (lp).
Exploitation requires traditional sendmail with support for the -C option and a subscribed event to trigger notification delivery.
Affected software
cups
How to mitigate CVE-2026-105326
Install security update from vendor's website.
cups - update to 2.4.20