Vulnerability details

Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to 0.0.40, an authenticated user who can create or edit a workflow with an Agent custom Python tool can bypass the blacklist-based sandbox in backend/app/services/python_tool_executor.py because allowed standard-library modules expose operating-system, process, and filesystem capabilities through public attributes that pass _safe_import() and _validate_code_safety(). The runner then executes the supplied tool with exec(), permitting commands and file operations as the backend application user; self-registration affects reachability, but portal triggering alone does not grant code control. This issue is fixed in 0.0.40.

• https://github.com/heymrun/heym/commit/b36d795c6ea841b8f1b511a0952e274487ee4ef3 x_refsource_MISC
• https://github.com/heymrun/heym/releases/tag/v0.0.40 x_refsource_MISC
• https://github.com/heymrun/heym/security/advisories/GHSA-wcgw-9hfw-f6f2 x_refsource_CONFIRM