CVE-2026-34990
Publication date 3 April 2026
Last updated 8 June 2026
Ubuntu priority
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 | 26.04 LTS resolute |
Fixed 2.4.16-1ubuntu1.2
|
| 25.10 questing |
Fixed 2.4.12-0ubuntu3.9
|
|
| 24.04 LTS noble |
Fixed 2.4.7-1.2ubuntu7.13
|
|
| 22.04 LTS jammy |
Fixed 2.4.1op1-1ubuntu4.20
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.8 · High
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | 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)
- USN-8405-1
- CUPS vulnerabilities
- 8 June 2026