{"id":"CVE-2026-55453","summary":"CUPS ipp backend status-line injection can update queue PPD and lead to conditional RCE as lp via foomatic-rip","details":"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.","aliases":["GHSA-7hqf-mfhx-7r3v"],"modified":"2026-10-16T02:48:01.382127904Z","published":"2026-10-15T17:11:21.208Z","database_specific":{"cwe_ids":["CWE-74","CWE-77","CWE-78"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55453.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55453.json"},{"type":"FIX","url":"https://github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d81dd7"},{"type":"FIX","url":"https://github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed596a"},{"type":"WEB","url":"https://github.com/OpenPrinting/cups/releases/tag/v2.4.20"},{"type":"ADVISORY","url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55453"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openprinting/cups","events":[{"introduced":"0"},{"fixed":"ef80eeaea51430a055948240eea3f28ef5354edf"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.4.20"}],"source":"AFFECTED_FIELD"}}],"versions":["v2.4.19","v2.4.18","v2.4.17","v2.4.16","v2.4.15","v2.4.14","v2.4.13","v2.4.12","v2.4.11","v2.4.10","v2.4.9","v2.4.8","v2.4.7","v2.4.6","v2.4.5","v2.4.3","v2.4.4","v2.4.2","v2.4.1","v2.4.0","v2.4rc1","v2.4b1","v2.3.3op2","v2.3.3op1","v2.3.3","v2.3.1","v2.3.0","v2.3rc1","v2.3b8","v2.3b7","v2.3b6","v2.3b5","v2.3b4","v2.3b3","v2.3b2","v2.3b1","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.2rc1","v2.2b2","v2.2b1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55453.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"}]}