{"id":"CVE-2026-72769","aliases":["GHSA-hx4h-vr3m-45vh"],"url":"https://o3.security/vulnerability/CVE-2026-72769","summary":"n8n before 1.123.67 Prototype Pollution via VM Expression Engine","details":"## Impact\n\nAn authenticated user able to create or edit a workflow expression could abuse the expression engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process, leading to a denial of service.\n\nBoth self-hosted and cloud instances running the VM expression engine are affected.\n\n## Patches\n\nThe issue has been fixed in n8n versions 1.123.67, 2.31.5, and 2.32.1. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\n\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict n8n instance access to fully trusted users only.\n- Disable the VM expression engine if an alternative is available for your deployment.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","published":"2026-08-11T12:17:09.195Z","modified":"2026-10-21T02:30:55.737605787Z","cvss":null,"epss":{"score":0.00253,"percentile":0.17054,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"n8n","fixedVersion":"1.123.67"},{"ecosystem":"npm","name":"n8n","fixedVersion":"2.32.1"},{"ecosystem":"npm","name":"n8n","fixedVersion":"2.31.5"}],"fix":{"url":"https://github.com/n8n-io/n8n/commit/f69dfc6dd2178a14ea1624d2e1d403c2e755042f","label":"n8n-io/n8n@f69dfc6"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72769.json"},{"type":"ADVISORY","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72769"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-vm-expression-engine"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/commit/f69dfc6dd2178a14ea1624d2e1d403c2e755042f"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.67"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.31.5"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.32.1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:30:55.737605787Z"}}