{"schemaVersion":3,"id":"CVE-2026-55467","aliases":["UBUNTU-CVE-2026-55467","DEBIAN-CVE-2026-55467"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-10-15T17:08:24.374Z","modified":"2026-10-15T17:49:26.673Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":2.5,"severity":"low","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":2.5,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":2.5,"severity":"low","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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Neutralization of CRLF Sequences ('CRLF Injection')","description":"The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/93.html"},{"id":"CWE-94","name":"Improper Control of Generation of Code ('Code Injection')","description":"The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/94.html"},{"id":"CWE-150","name":"Improper Neutralization of Escape, Meta, or Control Sequences","description":"The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as escape, meta, or control character sequences when they are sent to a downstream component.","type":"weakness","status":"Incomplete","abstraction":"Variant","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/150.html"}],"affected":[{"vendor":"debian","product":"cups","name":"cups","label":"cups","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/cups","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"cups-filters","name":"cups-filters","label":"cups-filters","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/cups-filters","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libcupsfilters","name":"libcupsfilters","label":"libcupsfilters","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libcupsfilters","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"openprinting","product":"cups","name":"cups","label":"cups","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.4.20","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.4.20","eol":null,"hubHref":"/vendor/openprinting/cups"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/CVE-2026-55467","label":"ubuntu.com/security/CVE-2026-55467","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55467","label":"www.cve.org/CVERecord?id=CVE-2026-55467","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7","label":"github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7","hostname":"github.com","tags":["X Refsource CONFIRM"]},{"url":"https://github.com/OpenPrinting/cups/commit/0cf4e7814d6810ed3c454222bce3aa342d541681","label":"github.com/OpenPrinting/cups/commit/0cf4e7814d6810ed3c454222bce3aa342d541681","hostname":"github.com","tags":["X Refsource 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