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High severity7.4NVD Advisory· Published Jul 3, 2026· Updated Sep 15, 2026

CVE-2026-9547

CVE-2026-9547

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

20

Patches

Vulnerability mechanics

References

3

News mentions

2