Improper Following of Specification by Caller Affecting openssh package, versions <1:10.2p1-2ubuntu3.4


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.18% (8th percentile)

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  • Snyk IDSNYK-UBUNTU2604-OPENSSH-17910455
  • published13 Jul 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?

Upgrade Ubuntu:26.04 openssh to version 1:10.2p1-2ubuntu3.4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh 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