{"schema":"threatline.record/2","record":{"id":"CVE-2026-55376","aliases":["GHSA-wcgw-9hfw-f6f2"],"summary":"heym Python Tool Sandbox Escape","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.","categories":["Unclassified"],"product":"heym","vendor":"heymrun","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-55376","source_modified_at":"2026-10-16T22:00:50.339Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"heym","vendor":"heymrun","versions":[{"version":"< 0.0.40","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00361,"percentile":0.28743,"score_date":"2026-10-23"},"published_at":"2026-10-13T15:12:49.604Z","modified_at":"2026-10-16T22:00:50.339Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-55376","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-16T22:00:50.339Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-55376","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/heymrun/heym/security/advisories/GHSA-wcgw-9hfw-f6f2","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/heymrun/heym/commit/b36d795c6ea841b8f1b511a0952e274487ee4ef3","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/heymrun/heym/releases/tag/v0.0.40","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"total","assessed_at":"2026-10-16T22:00:21.840218Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-16T22:00:50.339Z","content_hash":"fedbe138951e71ab8c868d7c0c177c2d37f9ee272dafee181a25ebe730559874"}}