Resource exhaustion in OpenSSH - #VU158350
Published: October 28, 2026
Vulnerability identifier: #VU158350
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially cause a denial of service through excessive CPU consumption before authentication.
The vulnerability exists due to CPU spinning caused by the NetBSD BROKEN_READ_COMPARISON workaround in OpenSSH when handling pre-authentication input. A remote attacker can potentially trigger the affected read-handling behavior over an SSH connection to consume server CPU resources.
Affected software
OpenSSH
Remediation
Install security update from vendor's website.
OpenSSH - update to 10.6p1