CRLF injection in cups - #VU154066
Published: October 12, 2026
Vulnerability identifier: #VU154066
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-93
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to inject scheduler status records and modify a print queue's PPD.
The vulnerability exists due to improper neutralization of CRLF sequences in scheduler/job.c::get_options() and the filter option parsing path when converting IPP job attributes into textual filter options. A remote user can submit a crafted binary IPP Print-Job request containing a malformed attribute name to inject scheduler status records and modify a print queue's PPD.
Exploitation requires access from the adjacent network, permission to submit jobs to a shared legacy PostScript/PPD queue, and a print path reaching the pstops filter.
Affected software
cups
Remediation
Install security update from vendor's website.
cups - update to 2.4.20