CVE-2026-59998 — MEDIUM (4.8)

Q: What is CVE-2026-59998?

CVE-2026-59998 is a vulnerability with a CVSS score of 4.8 (MEDIUM). sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows Active Directory.

Q: How severe is CVE-2026-59998?

CVE-2026-59998 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-59998?

Check the references section above for vendor advisories and patch information. Affected products include: Openbsd Openssh.

Vulnerability 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.

CVSS Score

4.8

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Openbsd	Openssh	< 10.4

Related Weaknesses (CWE)

CWE-573

References

https://marc.info/?l=openssh-unix-dev&m=178333966933090&w=2Release Notes
https://www.openssh.org/releasenotes.html#10.4p1Release Notes
https://www.openwall.com/lists/oss-security/2026/07/06/5Mailing ListRelease Notes

FAQ

What is CVE-2026-59998?

CVE-2026-59998 is a vulnerability with a CVSS score of 4.8 (MEDIUM). sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no value if the server is in Windows Active Directory.

How severe is CVE-2026-59998?

CVE-2026-59998 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-59998?

Check the references section above for vendor advisories and patch information. Affected products include: Openbsd Openssh.