VULNERABILITY INTELLIGENCE

CVE-2026-9547

CVSS score7.4 HIGH
EPSS probability0.36%
CISA KEVNot currently listed
Published2026-07-03
Last modified2026-09-15
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Weakness classification

  • 2499f714-1537-4658-8207-48ae4bb9eae9: CWE-297
  • nvd@nist.gov: NVD-CWE-Other

Primary references