---
id: CVE-2026-55453
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 backend/ipp.c quote_string()
  function preserves carriage-return and line-feed characters in a remote
  printer-contro…
severity: low
cvss: 3.3
cvssVector: '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
vendor: OpenPrinting
product: cups
affected:
  - cups < 2.4.20
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T18:17:27.677'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55453'
references:
  - url: >-
      https://github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d81dd7
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed596a
    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-7hqf-mfhx-7r3v
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-15T18:23:58.449Z'
---

## Overview

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.

## Remediation

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