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.

Affected products

Cups, Linuxmint, Red Os, Ubuntu

Openprinting Cups

≤ 2.4.16

CVSS 3.1

7.8 HIGH

EPSS

0.3% (21th percentile)

Weakness

CWE-287

NVD status

Analyzed

Published

2026-04-03