CVE-2026-86411 — 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 c…
Published: 2026-10-20 · CVSS: Unscored
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7