Vulnerability DatabaseCVE-2026-59851
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CVE-2026-59851
Published:July 21, 2026
Updated:August 04, 2026
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.
Affected Packages
https://gitlab.com/libssh/libssh-mirror.git (SCM_GIT):
Affected version(s) =libssh-0.12.0 <libssh-0.12.1
Fix Suggestion:
Update to version libssh-0.12.1
Related Resources (3)
https://access.redhat.com/security/cve/CVE-2026-59851
https://bugzilla.redhat.com/show_bug.cgi?id=2498184
https://access.redhat.com/errata/RHSA-2026:42922
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Incorrect Authorization
CWE-863
EPSS
Base Score:
0.27