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 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.

• CWE-74
• CWE-77
• CWE-78

• https://github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d81dd7Patch
• https://github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed596aPatch
• https://github.com/OpenPrinting/cups/releases/tag/v2.4.20Release Notes
• https://github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3vExploit, Patch, Vendor Advisory

Published

Oct 15, 2026

Last Modified

Oct 20, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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