What is CVE-2026-59998?

CVE-2026-59998 is a medium-severity vulnerability in Openbsd Openssh, classified under CWE-573. CVSS score: 4.8/10. Published 2026-07-08.

How severe is CVE-2026-59998?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Openbsd Openssh

CVE-2026-59998

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 v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Openbsd Openssh — versions 0

Weakness classification (CWE)

CWE-573

References

cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-59998?: CVE-2026-59998 is a medium-severity vulnerability in Openbsd Openssh, classified under CWE-573. CVSS score: 4.8/10. Published 2026-07-08.
How severe is CVE-2026-59998?: Medium severity. CVSS v3 base score is 4.8 out of 10.