Improper Following of Specification by Caller Affecting openssh-ssh1 package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.18% (7th percentile)

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  • Snyk IDSNYK-UBUNTU2604-OPENSSHSSH1-17910459
  • published6 Nov 2026
  • disclosed8 Jul 2026

Introduced: 8 Jul 2026

CVE-2026-59998  (opens in a new tab)
CWE-573  (opens in a new tab)

How to fix?

There is no fixed version for Ubuntu:26.04 openssh-ssh1.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh-ssh1 package and not the openssh-ssh1 package as distributed by Ubuntu. See How to fix? for Ubuntu:26.04 relevant fixed versions and status.

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 Base Scores

version 3.1