{"id":"CVE-2026-55376","title":"Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure","summary":"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…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-78","CWE-94","CWE-693"],"published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T16:17:21.853","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55376","references":[{"url":"https://github.com/heymrun/heym/commit/b36d795c6ea841b8f1b511a0952e274487ee4ef3","label":"security-advisories@github.com"},{"url":"https://github.com/heymrun/heym/releases/tag/v0.0.40","label":"security-advisories@github.com"},{"url":"https://github.com/heymrun/heym/security/advisories/GHSA-wcgw-9hfw-f6f2","label":"security-advisories@github.com"}],"tags":["nvd"],"ingestedAt":"2026-10-13T16:35:46.742Z","slug":"CVE-2026-55376","body":"## Overview\n\nHeym 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}