{"id":"GHSA-jwm3-qcfw-c5pp","revision":"491faca39cb94d6b918b09a43354e03d","records":[{"revision":"491faca39cb94d6b918b09a43354e03d","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-jwm3-qcfw-c5pp","aliases":["CVE-2026-56777"],"title":"n8n: Python Code Node AST Validator Bypass","description":"## 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.","state":0,"publishedAt":"2026-06-16T22:39:46+00:00","modifiedAt":"2026-07-08T08:27:03.8754915+00:00","affected":[{"ecosystem":"npm","name":"n8n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.26.0"},{"kind":"fixed","version":"2.26.2"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"n8n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.25.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","score":null,"severity":null},{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/n8n-io/n8n/security/advisories/GHSA-jwm3-qcfw-c5pp","https://github.com/n8n-io/n8n"],"sourceUrl":"https://github.com/advisories/GHSA-jwm3-qcfw-c5pp","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-jwm3-qcfw-c5pp","identifiers":["GHSA-jwm3-qcfw-c5pp","CVE-2026-56777"]},"retained":false,"historicalAffected":[]}],"coverage":[]}