{"id":"CVE-2026-55453","state":"PUBLISHED","title":"CUPS ipp backend status-line injection can update queue PPD and lead to conditional RCE as lp via foomatic-rip","description":"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.","publishedAt":"2026-10-15T17:11:21.208Z","updatedAt":"2026-10-16T17:12:58.110Z","severity":{"score":3.3,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["OpenPrinting cups"],"affected":[{"vendor":"OpenPrinting","product":"cups","versions":[{"version":"< 2.4.20","status":"affected"}]}],"references":["https://github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3v","https://github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d81dd7","https://github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed596a","https://github.com/OpenPrinting/cups/releases/tag/v2.4.20"],"weaknesses":["CWE-74","CWE-77","CWE-78"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55453.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55453","state":"PUBLISHED","datePublished":"2026-10-15T17:11:21.208Z","dateUpdated":"2026-10-16T17:12:58.110Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T22:10:37.607Z"},"containers":{"cna":{"title":"CUPS ipp backend status-line injection can update queue PPD and lead to conditional RCE as lp via foomatic-rip","descriptions":[{"lang":"en","value":"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":[{"vendor":"OpenPrinting","product":"cups","versions":[{"version":"< 2.4.20","status":"affected"}]}],"references":[{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3v","name":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3v","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d81dd7","name":"https://github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d81dd7","tags":["x_refsource_MISC"]},{"url":"https://github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed596a","name":"https://github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed596a","tags":["x_refsource_MISC"]},{"url":"https://github.com/OpenPrinting/cups/releases/tag/v2.4.20","name":"https://github.com/OpenPrinting/cups/releases/tag/v2.4.20","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"LOW","baseScore":3.3,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-74","lang":"en","description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-77","lang":"en","description":"CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-78","lang":"en","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-15T17:11:21.208Z"},"source":{"advisory":"GHSA-7hqf-mfhx-7r3v","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-15T20:24:45.854455Z","id":"CVE-2026-55453","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T17:12:58.110Z"}}]}}}