libcurl SSH Key Type Mismatch Allows Silent MITM via CURLOPT_SSH_KEYFUNCTION
CVE-2026-9547 Published on July 3, 2026

SSH improper host validation
When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the `CURLOPT_SSH_KEYFUNCTION` callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the `known_hosts` file. Instead of rejecting the mismatch, the callback mechanism fails to properly enforce the restriction, allowing the connection to succeed without warning and risking a potential man-in-the-middle attack.

NVD


Products Associated with CVE-2026-9547

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Canonical Ubuntu Linux
 
Haxx Curl
 

Affected Versions

curl: