This advisory has been withdrawn because it is a duplicate of GHSA-mj59-h3q9-ghfh. This link is maintained to preserve external references.

OpenClaw before 2026.4.20 contains an improper environment variable validation vulnerability in MCP stdio server configuration that allows attackers to execute arbitrary code. Malicious workspace configurations can pass dangerous startup variables like NODE OPTIONS, LD PRELOAD, or BASH ENV to spawned MCP server processes, enabling code injection when operators start sessions using those servers.