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CVE-2026-86411 is a low-severity authentication-context reuse vulnerability in curl and libcurl versions before 8.23.0. An FTP transfer configured with CURLUSESSL_NONE can reuse a pooled FTP control connection that a previous easy handle upgraded using STARTTLS and authenticated with a client certificate. The subsequent handle performs neither a new TLS handshake nor a new FTP login, causing the server to continue authorizing its operations under the previous handle's certificate identity.
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A curl FTP connection-reuse flaw allows a subsequent transfer to inherit a previous handle's client-certificate identity without a new TLS handshake or FTP login. Rated Low with CVSS v3.1 score 2.9, its stated impact is limited confidentiality loss. Fixes are pending for curl in Amazon Linux 2023 and Amazon Linux 2027 Preview; Amazon Linux 2 Core is listed as not affected.
An FTP connection-reuse flaw allows a transfer to reuse a connection authenticated with a client certificate from a previous configuration, creating an authentication-identity mix-up.
Low-severity vulnerability in curl fixed in version 8.23.0. The article provides no technical details.
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