{"id":"GHSA-jwm3-qcfw-c5pp","title":"n8n: Python Code Node AST Validator Bypass","summary":"n8n: Python Code Node AST Validator Bypass","severity":"medium","cvss":5,"cwe":["CWE-693"],"vendor":"n8n","product":"n8n","ecosystem":"npm","affected":["n8n >= 2.26.0, < 2.26.2","n8n < 2.25.7"],"patched":["n8n 2.26.2","n8n 2.25.7"],"published":"2026-06-16","updated":"2026-06-16","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-jwm3-qcfw-c5pp","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-jwm3-qcfw-c5pp"},{"url":"https://github.com/advisories/GHSA-jwm3-qcfw-c5pp"}],"tags":["ghsa","npm"],"ingestedAt":"2026-06-29T14:31:47.474Z","slug":"GHSA-jwm3-qcfw-c5pp","body":"## Overview\n\n## Impact\nAn authenticated user with permission to create or modify workflows containing a Python Code node could bypass the AST security validator and access the task executor module namespace. On self-hosted instances where `N8N_BLOCK_RUNNER_ENV_ACCESS=false` is set, this extended to disclosure of environment variables accessible to the task runner process.\n\nThis issue only affects instances where the Python Task Runner is enabled and `N8N_BLOCK_RUNNER_ENV_ACCESS=true`.\n\n## Patches\nThe issue has been fixed in n8n versions 2.25.7, and 2.26.2. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Limit workflow creation and editing permissions to fully trusted users only.\n- Disable the Python Code node by adding `n8n-nodes-base.code` to the `NODES_EXCLUDE` environment variable, or disable the Python Task Runner entirely.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.\n\n## Affected packages\n\n- `n8n >= 2.26.0, < 2.26.2`\n- `n8n < 2.25.7`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `n8n 2.26.2`\n- `n8n 2.25.7`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}