CVE-2026-55453: OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the backend/ipp.c quote_string() function…

PriorityP412low3.3CVSS 3.1

AVLACLPRNUIRSUCNINAL

EPSS

0.20%

9.5th percentile

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the backend/ipp.c quote_string() function preserves carriage-return and line-feed characters in a remote printer-controlled marker-message before report_attr() writes the value to the scheduler status stream. The scheduler can parse an injected newline as a separate PPD: control line and persist an attacker-selected PPD keyword. The reporter demonstrated that a later print job on a Foomatic-backed queue could consume an injected FoomaticRIPCommandLine value and execute in the filter context as lp. This issue is fixed in version 2.4.20.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
apple	cups	—	—
openprinting	cups	< 2.4.20	2.4.20

CVSS provenance

nvdv3.13.3LOWCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

vendor_redhat3.3LOW

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