A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerberos principal is authorized for the requested local user, allowing authenticated clients to log in as arbitrary users.

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Fixes

Solution

No solution given by the vendor.


Workaround

Disable GSSAPIKeyExchange.

History

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

Type Values Removed Values Added
References

Wed, 22 Jul 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


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

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Tue, 21 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in libssh. On servers with GSSAPIKeyExchange enabled, the gssapi-keyex path does not verify whether the authenticated Kerberos principal is authorized for the requested local user, allowing authenticated clients to log in as arbitrary users.
Title Libssh: libssh: authentication bypass via missing gssapi principal check
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Weaknesses CWE-863
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': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-07-22T19:06:52.468Z

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

Link: CVE-2026-59851

cve-icon Vulnrichment

Updated: 2026-07-22T18:15:40.738Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Important

Publid Date: 2026-07-21T14:14:14Z

Links: CVE-2026-59851 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses