ByteDance Deer-Flow versions prior to commit 92c7a20 contain a critical sandbox escape vulnerability in bash tool handling. The vulnerability allows attackers to execute arbitrary commands on the host system by bypassing regex-based validation using shell features like directory changes and relative paths. Attackers can exploit incomplete shell semantics modeling to read and modify files outside the sandbox boundary. The vulnerability enables arbitrary command execution through subprocess invocation with shell interpretation enabled. This represents a significant security flaw that undermines the sandbox security model.