Improper Authorization in OpenSSH - CVE-2026-35388

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU128477

Improper Authorization in OpenSSH - CVE-2026-35388

Published: April 29, 2026


Vulnerability identifier: #VU128477
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-35388
CWE-ID: CWE-285
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
OpenSSH
Software vendor:
OpenSSH

Description

The vulnerability allows a local user to bypass connection multiplexing confirmation.

The vulnerability exists due to improper access control in ssh(1) when handling proxy mode multiplexing sessions requested with ssh -O proxy under ControlMaster ask or autoask. A local user can initiate a proxy mode multiplexing session to bypass connection multiplexing confirmation.

The issue is limited to proxy mode multiplexing sessions.


Remediation

Install security update from vendor's website.

External links