CVE-2026-86411

Not enough EPSS history yet.

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.

• curl.sehttps://curl.se/docs/CVE-2026-86411.html
• curl.sehttps://curl.se/docs/CVE-2026-86411.json
• hackerone.comhttps://hackerone.com/reports/3973190

No related CVEs by CWE or product.