libcurl: reused FTP control conn via session when CURLOPT_USE_SSL=NONE
CVE-2026-86411 Published on October 20, 2026

FTP connection reuse inherits client-certificate
An `ftp://` transfer configured with `CURLUSESSL_NONE` can reuse a pooled FTP control connection that a previous easy handle upgraded with `STARTTLS` and authenticated using a client certificate. The second handle performs neither a new TLS handshake nor a new FTP login, so the server continues to authorize it under the first handle's certificate identity.

NVD


Products Associated with CVE-2026-86411

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Haxx Curl
 

Affected Versions

curl: