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.

Traduire en français

Produits concernés

• curl
• Haxx curl

Scores CVSS

Faiblesses (CWE)

• CWE-297

Références

• https://curl.se/docs/CVE-2026-9547.html PatchVendor Advisory
• https://curl.se/docs/CVE-2026-9547.json Vendor Advisory
• https://hackerone.com/reports/3751712 ExploitIssue TrackingThird Party Advisory
• https://hackerone.com/reports/3751712 ExploitIssue TrackingThird Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories