USN-8578-1: CUPS control character injection vulnerability
Publication date
21 July 2026
Overview
CUPS could be made to run programs as the lp user if it received specially crafted print job requests.
Releases
Packages
- cups - Common UNIX Printing System(tm)
Details
It was discovered that CUPS did not properly filter control characters in IPP string attributes and PPD keywords. An unauthenticated attacker could exploit this to execute arbitrary code as the lp user on systems with shared target queues.
It was discovered that CUPS did not properly filter control characters in IPP string attributes and PPD keywords. An unauthenticated attacker could exploit this to execute arbitrary code as the lp user on systems with shared target queues.
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 16.04 LTS xenial | cups – 2.1.3-4ubuntu0.11+esm13 | ||
| cups-bsd – 2.1.3-4ubuntu0.11+esm13 | |||
| cups-client – 2.1.3-4ubuntu0.11+esm13 | |||
| cups-common – 2.1.3-4ubuntu0.11+esm13 | |||
| cups-core-drivers – 2.1.3-4ubuntu0.11+esm13 | |||
| cups-daemon – 2.1.3-4ubuntu0.11+esm13 | |||
| libcups2 – 2.1.3-4ubuntu0.11+esm13 | |||
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