A vulnerability has been found in the Python venv module and CLI. Path names provided when creating a virtual environment were not quoted properly, allowing the creator to inject commands into virtual environment "activation" scripts, for example, "source venv/bin/activate". This flaw allows attacker-controlled virtual environments to run commands when the virtual environment is activated.

A flaw was found in Python. In certain configurations, the asyncio._SelectorSocketTransport.writelines() method fails to signal the protocol to clear the write buffer when it approaches capacity. Because of this, protocols would not periodically drain the write buffer, potentially leading to a denial of service via memory exhaustion.