CVE-2026-45374: DeepSeek TUI: task_create Insecure Defaults Enable RCE via Prompt Injection in Project Files

The task_create tool spawns durable sub-agents that inherit two insecure defaults:

• allow_shell defaults to true (config.rs:1499: self.allow_shell.unwrap_or(true))
• auto_approve defaults to true (task_manager.rs:297: auto_approve: Some(true))

When a user approves a task_create call (which requires ApprovalRequirement::Required), they approve what appears to be a benign work prompt (e.g., “fix TODOs and write a README”). However, the spawned sub-agent silently receives unrestricted, unapproved shell access. Neither allow_shell nor auto_approve need to be explicitly specified by the model and both default to true.