CVE-2026-5773

libcurl might in some circumstances reuse the wrong connection for SMB(S)

transfers.

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 network transfer operation that was requested by an

application could wrongfully reuse an existing SMB connection to the same

server that was using a different "share" than the new subsequent transfer

should.

This could in unlucky situations lead to the download of the wrong file or the

upload of a file to the wrong place. When this happens, the same credentials

are used and the server name is the same.