Missing Authentication for Critical Function Affecting openssh-keycat package, versions <0:8.7p1-45.el9_6.3


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.13% (3rd percentile)

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  • Snyk IDSNYK-RHEL9-OPENSSHKEYCAT-16688702
  • published14 May 2026
  • disclosed2 Apr 2026

Introduced: 2 Apr 2026

CVE-2026-35388  (opens in a new tab)
CWE-306  (opens in a new tab)

How to fix?

Upgrade RHEL:9 openssh-keycat to version 0:8.7p1-45.el9_6.3 or higher.
This issue was patched in RHSA-2026:16059.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh-keycat package and not the openssh-keycat package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.

CVSS Base Scores

version 3.1