Unprotected Alternate Channel Affecting openssh package, versions <1:8.9p1-3ubuntu0.15


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.13% (3rd percentile)

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  • Snyk IDSNYK-UBUNTU2204-OPENSSH-15926780
  • published1 May 2026
  • disclosed2 Apr 2026

Introduced: 2 Apr 2026

CVE-2026-35388  (opens in a new tab)
CWE-420  (opens in a new tab)

How to fix?

Upgrade Ubuntu:22.04 openssh to version 1:8.9p1-3ubuntu0.15 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:22.04 relevant fixed versions and status.

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

CVSS Base Scores

version 3.1