AIKIDO-2026-742200
net-ssh is vulnerable to Authorization Bypass
80
High Risk
This Affects:
net-sshTL;DR
Net::SSH::Service::Forward#initialize registers auth-agent and auth-agent@openssh.com channel handlers inside on_open_channel even when forward_agent is not enabled. A server the client connects to can open an inbound channel and reach the client's local SSH agent through auth_agent_channel when the client requests port forwarding, even if agent forwarding was never enabled. The fix registers those handlers only when the client has enabled agent forwarding.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use SSH port forwarding on a connection to a server you do not fully control.
Background info
net-ssh is vulnerable to Authorization Bypass in versions 0.0.1 - 7.3.4.
How to fix this
Upgrade the net-ssh library to the patch version.
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