A flaw was found in OpenSSH. A username entered on the ssh command line can still contain '$' or a non-trailing backslash. When a configuration expands %u inside ProxyCommand or Match exec, those characters are passed into the shell.

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Fixes

Solution

No solution given by the vendor.


Workaround

Do not place an untrusted username on the ssh command line when ProxyCommand or Match exec expands %u. Avoid expanding %u into a shell command.

History

Thu, 15 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 15 Oct 2026 05:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in OpenSSH. A username entered on the ssh command line can still contain '$' or a non-trailing backslash. When a configuration expands %u inside ProxyCommand or Match exec, those characters are passed into the shell.
Title Openssh: openssh: '$' and '\' in a command-line username expand through %u
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
Weaknesses CWE-78
CPEs cpe:/a:redhat:hummingbird:1
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-15T15:00:41.915Z

Reserved: 2026-10-15T04:33:31.442Z

Link: CVE-2026-110925

cve-icon Vulnrichment

Updated: 2026-10-15T15:00:29.767Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-15T06:17:01.243

Modified: 2026-10-15T16:33:26.290

Link: CVE-2026-110925

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-15T00:00:00Z

Links: CVE-2026-110925 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-15T12:00:18Z

Weaknesses