{"id":"CVE-2026-55467","summary":"CUPS fax option values bypass the CVE-2026-34980 control-character sanitizer (incomplete fix)","details":"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.","aliases":["GHSA-69qc-prxg-h2c7"],"modified":"2026-10-16T02:47:47.991449183Z","published":"2026-10-15T17:08:24.374Z","database_specific":{"cwe_ids":["CWE-150","CWE-93","CWE-94"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55467.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55467.json"},{"type":"FIX","url":"https://github.com/OpenPrinting/cups/commit/0cf4e7814d6810ed3c454222bce3aa342d541681"},{"type":"FIX","url":"https://github.com/OpenPrinting/cups/commit/a9e7e7a3a019d0fa063d29409d3f82e4c6d5a008"},{"type":"WEB","url":"https://github.com/OpenPrinting/cups/releases/tag/v2.4.20"},{"type":"ADVISORY","url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55467"}],"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-2026-55467.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"}]}