{"id":"EUVD-2026-40453","revision":"cb2ba338934d4751aa66bd3ef3336a5e","records":[{"revision":"cb2ba338934d4751aa66bd3ef3336a5e","observedAt":"2026-11-01T10:15:38.077+00:00","statement":{"source":"euvd","id":"EUVD-2026-40453","aliases":["CVE-2026-56777","GHSA-x2rh-rhm8-cv8v"],"title":"n8n before 2.25.7 and 2.26.x before 2.26.2 contains an abstract syntax tree (AST) security validator bypass in the Python Code node. An authenticated user with permission to create or modify workflows containing a Python Code node can bypas…","description":"n8n before 2.25.7 and 2.26.x before 2.26.2 contains an abstract syntax tree (AST) security validator bypass in the Python Code node. An authenticated user with permission to create or modify workflows containing a Python Code node can bypass the validator and access the task executor module namespace. The issue only affects self-hosted instances where the Python Task Runner is enabled; where N8N_BLOCK_RUNNER_ENV_ACCESS is configured to allow it, this can disclose environment variables accessible to the task runner process.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N","score":5.3,"severity":null}],"references":["https://github.com/n8n-io/n8n/security/advisories/GHSA-jwm3-qcfw-c5pp","https://www.vulncheck.com/advisories/n8n-ast-validator-bypass-in-python-code-node"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-40453","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 30, 2026, 10:08:41 PM","dateUpdated":"Oct 29, 2026, 9:16:00 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-40453","identifiers":["EUVD-2026-40453","CVE-2026-56777","GHSA-x2rh-rhm8-cv8v"]},"retained":false,"historicalAffected":[]}],"coverage":[]}