CVE-2026-4480
Publication date 26 May 2026
Last updated 27 May 2026
Ubuntu priority
Description
A flaw was found in the Samba printing subsystem. Samba passes the client-controlled job description string to the command configured with the "print command" setting via the "%J" substitution character without escaping shell meta characters. A remote attacker could exploit this vulnerability by sending a specially crafted print job description that contains unescaped shell characters. This could lead to remote code execution on the affected system.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| samba | 26.04 LTS resolute |
Fixed 2:4.23.6+dfsg-1ubuntu2.1
|
| 25.10 questing |
Fixed 2:4.22.3+dfsg-4ubuntu2.4
|
|
| 24.04 LTS noble |
Fixed 2:4.19.5+dfsg-4ubuntu9.6
|
|
| 22.04 LTS jammy |
Fixed 2:4.15.13+dfsg-0ubuntu1.12
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
Notes
mdeslaur
non-default configuration that has "%J" substitution character in "print command" configuration. By default, samba on Ubuntu is configured with "printing = cups" and uses the cups API directly, not "print command".
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.5 · High
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-8306-1
- Samba vulnerabilities
- 26 May 2026