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medium advisory

OpenSSH sshd GSSAPI Behavior Vulnerability CVE-2026-59998

CVE-2026-59998 describes an undocumented security-relevant behavior in sshd, a component of OpenSSH, specifically in versions prior to 10.4, where the GSSAPIStrictAcceptorCheck setting reportedly has no value when the server is operating within a Windows Active Directory environment.

sshd in OpenSSH < 10.4 +1 vulnerability openssh gssapi active-directory windows misconfiguration
1c
medium advisory

OpenSSH GSSAPI Vulnerability Leads to Potential Denial-of-Service

A remote, anonymous attacker can exploit a vulnerability in OpenSSH GSSAPI and Ubuntu Linux to trigger undefined behavior or a potential denial-of-service attack.

openssh gssapi denial-of-service linux
2r 1t