CVE WatchOct 13, 2026

CVE-2026-55376

Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to 0.0.40, an authenticated user

CVSS

8.8

High

EPSS

0.4%

p28

KEV

—

Exploit Today

0-100

Published: Oct 13, 2026 · Last modified: Oct 13, 2026 · CWE-78 · CWE-94 · CWE-693

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

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