This indicates an attack attempt to exploit a Code Injection vulnerability in Docker.
This vulnerability is due to an error when the vulnerable software handle a maliciously crafted HTTP request to an unprotected TCP port. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted HTTP request.
Docker in python
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently, we are unaware of any vendor supplied patch for this issue.