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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55453
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 18:17:27 UTC
Updated2026-10-20 19:38:09 UTC
DescriptionOpenPrinting 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.

Risk And Classification

Primary CVSS: v3.1 3.3 LOW from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS: 0.001810000 probability, percentile 0.072200000 (date 2026-10-20)

Problem Types: CWE-74 | CWE-77 | CWE-78 | CWE-74 CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') | CWE-77 CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.3LOWCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
3.1CNADECLARED3.3LOWCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Openprinting Cups All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenPrinting Cups affected < 2.4.20 Not specified

References

ReferenceSourceLinkTags
github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3v [email protected] github.com Exploit, Patch, Vendor Advisory
github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed... [email protected] github.com Patch
github.com/OpenPrinting/cups/releases/tag/v2.4.20 [email protected] github.com Release Notes
github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d8... [email protected] github.com Patch
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