---
id: CVE-2026-55467
title: >-
  OpenPrinting CUPS is an open source printing system for Linux and other
  Unix-like operating systems
summary: >-
  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-strin…
severity: low
cvss: 2.5
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-93
  - CWE-94
  - CWE-150
vendor: OpenPrinting
product: cups
affected:
  - cups < 2.4.20
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T18:17:27.833'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55467'
references:
  - url: >-
      https://github.com/OpenPrinting/cups/commit/0cf4e7814d6810ed3c454222bce3aa342d541681
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenPrinting/cups/commit/a9e7e7a3a019d0fa063d29409d3f82e4c6d5a008
    label: security-advisories@github.com
  - url: 'https://github.com/OpenPrinting/cups/releases/tag/v2.4.20'
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T17:49:04.144102Z'
ingestedAt: '2026-10-15T18:23:58.450Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.