CVE-2026-59998 in OpenSSH

Summary

by MITRE • 07/08/2026

sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows Active Directory.

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• Responsible: MITRE
• Reservation: 07/08/2026
• Disclosure: 07/08/2026
• Moderation: accepted
• Entry: VDB-376760
• CPE: ready
• CWE: Unknown
• CVSS: 5.5 (VulDB)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Police, Insurance, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-59998
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59998
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-59998/