AIKIDO-2026-940971
net-ssh is vulnerable to Denial of Service (DoS)
58
Medium Risk
This Affects:
net-sshTL;DR
Net::SSH::Transport::ServerVersion#read! appends every byte received from the server to @version, then to @header, one at a time until it sees a newline, with no maximum length on either buffer. A malicious server that sends an identification line without a trailing newline forces the client to keep buffering indefinitely before authentication, growing memory without limit. The fix caps the identification string length and disconnects once it is exceeded.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you connect to an SSH server that is malicious or compromised.
Background info
net-ssh is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 7.3.4.
How to fix this
Upgrade the net-ssh library to the patch version.
Are You Affected?
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SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
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