CVE-2026-59998 PUBLISHED

Assigner: mitre
Reserved: 08.07.2026 Published: 08.07.2026 Updated: 08.07.2026

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

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 4.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	OpenBSD
Product	OpenSSH
Versions	Default: unaffected affected from 0 to 10.4 (excl.)

References

https://www.openwall.com/lists/oss-security/2026/07/06/5
https://marc.info/?l=openssh-unix-dev&m=178333966933090&w=2
https://www.openssh.org/releasenotes.html#10.4p1

Problem Types

CWE-573 Improper Following of Specification by Caller CWE