{"id":"CVE-2026-55467","published":"2026-10-15T18:17:27.833","lastModified":"2026-10-16T16:00:33.533","description":"OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the cupsdCreateJob option-string builder in scheduler/job.c maps attacker-controlled destination-uri and pre-dial-string values from a configured fax queue to the phone and faxPrefix options. Unlike ordinary IPP job attributes, these mapped fax values bypass the control-character sanitizer and are copied directly into the filter options argument. A user permitted to submit a job can therefore inject control characters into the downstream option stream. The reporter states that a downstream fax filter passing these values to a shell or modem command could execute code as lp, while the maintainer states that CUPS has no confidentiality or integrity impact because the only known code-executing filter is optional Foomatic and addressed separately, leaving possible disruption of the affected queue. This issue is fixed in version 2.4.20.","cvssScore":2.5,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","cwes":["CWE-93","CWE-94","CWE-150"],"vendors":[],"products":[],"references":[{"url":"https://github.com/OpenPrinting/cups/commit/0cf4e7814d6810ed3c454222bce3aa342d541681","tags":[]},{"url":"https://github.com/OpenPrinting/cups/commit/a9e7e7a3a019d0fa063d29409d3f82e4c6d5a008","tags":[]},{"url":"https://github.com/OpenPrinting/cups/releases/tag/v2.4.20","tags":[]},{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7","tags":[]},{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7","tags":[]}],"exploitRefs":[{"url":"https://github.com/OpenPrinting/cups/commit/0cf4e7814d6810ed3c454222bce3aa342d541681","tags":[]},{"url":"https://github.com/OpenPrinting/cups/commit/a9e7e7a3a019d0fa063d29409d3f82e4c6d5a008","tags":[]},{"url":"https://github.com/OpenPrinting/cups/releases/tag/v2.4.20","tags":[]},{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7","tags":[]},{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7","tags":[]}],"hasPoc":true,"ai":null}