FTP connection reuse inherits client-certificate
CVE-2026-86411 is fixed in curl on 1 platform, first by DEBIAN-CVE-2026-86411, released October 16, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| curl · Debian 14 | 8.22.0-1 | DEBIAN-CVE-2026-86411 | Oct 16, 2026 |
| curl · sles 15.6 | 8.22.0-150600.4.58.1 | SUSE-SU-2026:5069-1 | Nov 7, 2026 |
| curl · sles 15.7 | 8.22.0-150700.7.33.1 | SUSE-SU-2026:5068-1 | Nov 7, 2026 |
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