CVE-2026-92389

libcurl's TFTP state machine fails to validate state transitions against the

requested transfer direction, accepting opening server responses for both

reads and writes interchangeably. A malicious TFTP server can respond to a

download request in a way that forces the client into transmit mode, prompting

libcurl to consume and transmit data from the handle's persistent

`CURLOPT_READDATA` pointer - including data remaining from unrelated prior

operations, such as an HTTP POST request executed on a reused handle.