Improper access control in OpenSSH - CVE-2026-35387

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU128476

Improper access control in OpenSSH - CVE-2026-35387

Published: April 29, 2026


Vulnerability identifier: #VU128476
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-35387
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
OpenSSH
Software vendor:
OpenSSH

Description

The vulnerability allows a remote user to bypass configured public key algorithm restrictions.

The vulnerability exists due to improper access control in sshd(8) when applying PubkeyAcceptedAlgorithms and HostbasedAcceptedAlgorithms to ECDSA keys. A remote user can authenticate using an unlisted ECDSA algorithm to bypass configured public key algorithm restrictions.

The issue occurs when one of these directives includes any ECDSA algorithm name.


Remediation

Install security update from vendor's website.

External links