CVE-2026-34990

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/OpenPrinting/cups/security/advisories/GHSA-c54j-2vqw-wpwp	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:*

History

16 Apr 2026, 18:15

Type	Values Removed	Values Added
First Time		Openprinting cups Openprinting
CPE		cpe:2.3:a:openprinting:cups::::::::
References	~~() https://github.com/OpenPrinting/cups/security/advisories/GHSA-c54j-2vqw-wpwp -~~	() https://github.com/OpenPrinting/cups/security/advisories/GHSA-c54j-2vqw-wpwp - Exploit, Vendor Advisory

06 Apr 2026, 19:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8

03 Apr 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-03 22:16

Updated : 2026-04-16 18:15

NVD link : CVE-2026-34990

Mitre link : CVE-2026-34990

CVE.ORG link : CVE-2026-34990

JSON object : View

Products Affected

openprinting

cups

CWE

CWE-287

Improper Authentication

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