CVE-2026-9547

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.

• CWE-297

• https://curl.se/docs/CVE-2026-9547.htmlPatch, Vendor Advisory
• https://curl.se/docs/CVE-2026-9547.jsonVendor Advisory
• https://hackerone.com/reports/3751712Exploit, Issue Tracking, Third Party Advisory
• https://hackerone.com/reports/3751712Exploit, Issue Tracking, Third Party Advisory

Published

Jul 3, 2026

Last Modified

Sep 15, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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