CVE-2026-34990
OpenPrinting CUPS: Local print admin token disclosure using temporary printers
- Published
- Apr 3, 2026
- Updated
- Apr 6, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Sep 30, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XLow · next 30 days
- Percentile
- 21.7%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
Python PoC reproducing the CUPS 2.4.16 local-printer flaw: captures the Local auth token via a rogue IPP endpoint, creates a file:// printer, and races a job to write root-owned files.
CVE-2026-34990 — CUPS <= 2.4.16 Local Privilege Escalation
LPE PoC for CVE-2026-34990 using a CUPS root file write vulnerability.
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