Detections
Analytics
CVE-2026-86411
critical
Description
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.
References
https://hackerone.com/reports/3973190
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105276