CVE-2026-34990
CVE-2026-34990
Weakness (CWE)
CVSS Vector
v4.0- Attack Vector
- Local
- Attack Complexity
- Low
- Attack Requirements
- Present
- Privileges Required
- Low
- User Interaction
- None
- Confidentiality (Vulnerable)
- Low
- Integrity (Vulnerable)
- Low
- Availability (Vulnerable)
- None
- Confidentiality (Subsequent)
- High
- Integrity (Subsequent)
- High
- Availability (Subsequent)
- Low
Description
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.