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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (6.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- OpenBSD OpenSSH — versions 0
Weakness classification (CWE)
References
- www.openwall.com/lists/oss-security/2026/07/06/5 (Mailing List, Release Notes)
- marc.info/ (Release Notes)
- www.openssh.org/releasenotes.html (Release Notes)
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.