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Vulnerability · Published Oct 15, 2026 · Assigned by GitHub_M

CVE-2026-55453CUPS ipp backend status-line injection can update queue PPD and lead to conditional RCE as lp via foomatic-rip

Low 3.3

In plain English

A low-severity injection in cups from OpenPrinting. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).

Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.2%top 90.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12cupsno fix listedDEBIAN-CVE-2026-55453
Debian:13cupsno fix listedDEBIAN-CVE-2026-55453
Debian:14cupsno fix listedDEBIAN-CVE-2026-55453
Ubuntu:22.04:LTScupsno fix listedUBUNTU-CVE-2026-55453
Ubuntu:24.04:LTScupsno fix listedUBUNTU-CVE-2026-55453
Ubuntu:26.04:LTScupsno fix listedUBUNTU-CVE-2026-55453
Ubuntu:26.10cupsno fix listedUBUNTU-CVE-2026-55453

Affected products (as reported)

VendorProductVersions
OpenPrinting cups < 2.4.20

Weakness: CWE-74, CWE-77, CWE-78 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

References