A vulnerability in Wasmtime wasi's wasip3 UDP `send` function allows sending a datagram to an address that should only be permitted for receiving. This issue affects multiple versions of wasmtime-wasi prior to fixed releases. The flaw has a medium severity with a CVSS score of 6.4 and impacts confidentiality and integrity but not availability. Official patches are available in versions 48.0.8, 49.0.5, and 50.0.1.