A flaw was found in curl that can allow unauthorized access through improper session reuse. When an unencrypted File Transfer Protocol (FTP) transfer reuses a pooled connection previously authenticated with a client certificate and upgraded using Transport Layer Security (TLS), curl fails to perform a new handshake or authentication. As a result, the subsequent transfer operates under the prior session's identity, allowing it to perform operations on the remote server with unintended authorization.
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Sat, 17 Oct 2026 00:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in curl that can allow unauthorized access through improper session reuse. When an unencrypted File Transfer Protocol (FTP) transfer reuses a pooled connection previously authenticated with a client certificate and upgraded using Transport Layer Security (TLS), curl fails to perform a new handshake or authentication. As a result, the subsequent transfer operates under the prior session's identity, allowing it to perform operations on the remote server with unintended authorization. | |
| Title | curl: curl: FTP connection reuse inherits client-certificate | |
| Weaknesses | CWE-488 | |
| References |
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| Metrics |
threat_severity
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cvssV3_1
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Updated: 2026-10-17T02:00:07Z
Weaknesses