dectalk-tts is a Node package to interact with the aeiou Dectalk web API. In dectalk-tts@1.0.0, network requests to the third-party API are sent over HTTP, which is unencrypted. Unencrypted traffic can be easily intercepted and modified by attackers. Anyone who uses the package could be the victim of a man-in-the-middle (MITM) attack. The network request was upgraded to HTTPS in version 1.0.1. There are no workarounds, but some precautions include not sending any sensitive information and carefully verifying the API response before saving it.
The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint.