CVE-2026-5545— wrong reuse of HTTP Negotiate connection

wrong reuse of HTTP Negotiate connection

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. An application that first uses Negotiate authentication to a server with `user1:password1` and then does another operation to the same server asking for any authentication method but for `user2:password2` (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1...

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libcurl 代码问题漏洞

libcurl是cURL开源的一个免费且易于使用的客户端 URL 传输库。 libcurl存在代码问题漏洞，该漏洞源于连接重用逻辑错误，可能导致在Negotiate认证后错误地重用使用不同凭据的现有连接。

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