CVE-2026-34990

Publication date 3 April 2026

Last updated 8 June 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
cups 26.10 stonking
Not affected
26.04 LTS resolute
Fixed in 2.4.16-1ubuntu1.2
25.10 questing
Fixed in 2.4.12-0ubuntu3.9
24.04 LTS noble
Fixed in 2.4.7-1.2ubuntu7.13
22.04 LTS jammy
Fixed in 2.4.1op1-1ubuntu4.20
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
cups

Severity score breakdown

CVSS version:

Base score 5.0 · Medium

Vector: 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

Base score 7.8 · High

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

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities