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.
Published: 2026-07-21
Score: 3.9 Low
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Make sure you are not executing connections with untrusted username inputs.

Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6410-1 libssh security update
History

Wed, 12 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-78

Wed, 29 Jul 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200

Mon, 27 Jul 2026 23:30:00 +0000

Type Values Removed Values Added
First Time appeared Libssh
Libssh libssh
Redhat hardened Images
Vendors & Products Libssh
Libssh libssh
Redhat hardened Images

Fri, 24 Jul 2026 04:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200

Thu, 23 Jul 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-77

Wed, 22 Jul 2026 20:00:00 +0000

Type Values Removed Values Added
References

Wed, 22 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Wed, 22 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Tue, 21 Jul 2026 13:15:00 +0000

Type Values Removed Values Added
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.
Title Libssh: libssh: information disclosure via proxycommand %r username expansion
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
CPEs cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 3.9, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N'}


Subscriptions

Libssh Libssh
Redhat Enterprise Linux Hardened Images Hummingbird
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-12T19:08:22.876Z

Reserved: 2026-07-07T15:40:24.561Z

Link: CVE-2026-59846

cve-icon Vulnrichment

Updated: 2026-07-22T14:03:18.765Z

cve-icon NVD

Status : Modified

Published: 2026-07-21T13:17:18.143

Modified: 2026-08-12T20:17:45.973

Link: CVE-2026-59846

cve-icon Redhat

Severity : Low

Publid Date: 2026-07-21T12:46:04Z

Links: CVE-2026-59846 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T11:30:16Z

Weaknesses