CVE-2026-59846
Publication date 21 July 2026
Last updated 31 August 2026
Ubuntu priority
Medium
Description
A flaw was found in libssh. A malicious username expanded through %r in ProxyCommand handling can inject shell metacharacters, exposing environment variables and causing unintended shell behavior.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libssh | 26.04 LTS resolute |
Fixed 0.11.3-1ubuntu2.1
|
| 24.04 LTS noble |
Fixed 0.10.6-2ubuntu0.5
|
|
| 22.04 LTS jammy |
Fixed 0.9.6-2ubuntu0.22.04.8
|
|
| 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 |
|---|---|
| libssh |
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score 3.9 · Low
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
References
Related Ubuntu Security Notices (USN)
- USN-8699-1
- libssh vulnerabilities
- 31 August 2026