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CVE-2026-67543 – Heym Unsandboxed skill code execution: skills run via a local backend subprocess without the Docker isolation that Python tools mandate

Posted on November 12, 2026
CVE ID :CVE-2026-67543

Published : Nov. 11, 2026, 10:17 p.m. | 58 minutes ago

Description :Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to version 0.0.70, heym hardens one untrusted-code path but not its sibling. The Python tool executor (python_tool_executor.py) treats user code as untrusted and mandates a Docker sandbox (no network, read-only fs, non-root, no docker socket), failing closed. The skill executor (skill_python_executor.py) runs skill Python via a local backend subprocess with no Docker isolation — only a 512 MB RLIMIT and a 7-key env denylist — so a skill executes inside the backend execution context, with filesystem access, network egress, and non-denylisted environment variables that should not be exposed to untrusted/shared skills. In the shipped Docker config (backend runs as root + /var/run/docker.sock mounted), this escalates to host root. This issue has been patched in version 0.0.70.

Severity: 8.8 | HIGH

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