CVE-2026-59998

openssh: OpenSSH: Undocumented GSSAPIStrictAcceptorCheck behavior impacts security in Windows Active Directory

Published Jul 8, 2026 CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Description
sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows Active Directory.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-8533-1 OpenSSH vulnerabilities
Ubuntu USN Ubuntu USN USN-8804-1 OpenSSH vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Title openssh: OpenSSH: Undocumented GSSAPIStrictAcceptorCheck behavior impacts security in Windows Active Directory
Weaknesses CWE-909
References
Metrics threat_severity

None

threat_severity

Moderate

Type Values Removed Values Added
Description sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows Active Directory.
First Time appeared Openbsd
Openbsd openssh
Weaknesses CWE-573
CPEs cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
Vendors & Products Openbsd
Openbsd openssh
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jul 8, 2026, 1:48 PM
Reserved
Jul 8, 2026, 12:11 AM
Status
Analyzed
Published
Jul 8, 2026, 1:16 AM
Modified
Oct 25, 2026, 8:10 PM
Severity
Moderate
Public date
Jul 8, 2026, 12:11 AM