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7.4High

CVE-2026-9547SSH improper host validation

curl curl Published: (4 months ago)

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 (CWE): CWE-297

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

VendorProductVersions
curl curl 7.69.0 – < 8.14.2, 8.15.0 – < 8.16.1, 8.17.0 – < 8.20.1
haxx curl 7.69.0 – < 8.21.0

References and patches

CPE matches (NVD) (1)
  • cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* ≥ 7.69.0 < 8.21.0

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