Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/1.1 parser accepts differing duplicate Content-Length headers and uses the last value instead of rejecting the message. When an Ember server is behind a keep-alive intermediary that selects a different occurrence, an unauthenticated attacker can create CL.CL request smuggling that bypasses front-end controls, captures a later user’s headers, or poisons a cache. The shared client parser can also misframe responses from a malicious or compromised upstream when the client acts as a proxy for multiple downstream consumers. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

A buffer overflow vulnerability in the packet handoff plugin allows an attacker to overwrite memory outside the plugin's buffer.

A malformed packet can cause a buffer overflow in the NWK/APS layer of the Ember ZNet stack and lead to an assert

A malformed 802.15.4 packet causes a buffer overflow to occur leading to an assert and a denial of service. A watchdog reset clears the error condition automatically.