Locking your ssh-agent exposed local-only keys until OpenSSH 10.5

Help Net Security

August 11, 2026 at 9:15 AM

Overview

A vulnerability in OpenSSH versions prior to 10.5 allowed users to inadvertently expose local-only keys when locking the ssh-agent. In OpenSSH 10.4, locking the agent disabled a security check that determined whether connection requests came from the local machine or a remote, forwarded connection. This flaw meant that if users locked their ssh-agent, it could still respond to requests that shouldn't be permitted. The issue was addressed in the recently released OpenSSH 10.5, which restores the proper functionality of the lock feature. Users relying on ssh-agent for secure connections should update to this version to ensure their private keys remain protected.

Key Takeaways

Affected Systems: OpenSSH versions prior to 10.5
Action Required: Update to OpenSSH version 10.
Timeline: Disclosed on October 31, 2023

Original Article Summary

Lock your ssh-agent and it should sit there refusing to sign anything until you unlock it. In OpenSSH 10.4, locking it also switched off the check that tells the agent whether a request came from your own machine or arrived down a forwarded connection from a remote server. The fix shipped today in OpenSSH 10.5. The agent holds your decrypted private keys so you are not retyping a passphrase every few minutes, and agent forwarding … More → The post Locking your ssh-agent exposed local-only keys until OpenSSH 10.5 appeared first on Help Net Security.

Impact

OpenSSH versions prior to 10.5

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Disclosed on October 31, 2023

Remediation

Update to OpenSSH version 10.5 or later.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Vulnerability, Update.

Read Original Article

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