{"id":"CVE-2026-55453","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55453","generatedAt":"2026-10-28T01:12:21.709Z","title":"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.","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.","published":"2026-10-15T18:17:28.000Z","lastModified":"2026-10-20T19:38:09.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":3.3,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"},"cwe":["CWE-74","CWE-77","CWE-78"],"affected":["openprinting/cups"],"epss":{"score":0.00195,"percentile":0.09063,"date":"2026-10-26","history":[{"date":"2026-10-16","score":0.00181,"percentile":0.07152}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-15T18:17:28.000Z","detail":{"score":"3.3","severity":"LOW","publishedAt":"2026-10-15T18:17:27.677Z"},"summary":"New CVE, low severity (CVSS 3.3)."}],"references":[{"url":"https://github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d81dd7","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed596a","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/OpenPrinting/cups/releases/tag/v2.4.20","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3v","tags":["Exploit","Patch","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55453","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}