{"id":"CVE-2026-72769","title":"n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine","summary":"n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a …","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","cwe":["CWE-1321"],"vendor":"n8n","product":"n8n","affected":["n8n < 1.123.67","n8n >= 2.0.0, < 2.31.5","n8n = 2.32.0"],"patched":["n8n 2.31.5"],"published":"2026-08-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:46:21.837","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72769","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-vm-expression-engine","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00282,"epssPercentile":0.20953,"ingestedAt":"2026-09-09T21:22:45.527Z","slug":"CVE-2026-72769","body":"## Overview\n\nn8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host built-in and pollute its prototype in the main n8n process (a sandbox escape), leading to a denial of service. Both self-hosted and cloud instances running the VM expression engine are affected.\n\n## Affected\n\n- `n8n < 1.123.67`\n- `n8n >= 2.0.0, < 2.31.5`\n- `n8n = 2.32.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `n8n 2.31.5`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":207458,"id":"CVE-2026-72769","ts":1789761005647,"field":"cvss","old":null,"new":"8.1"},{"seq":207457,"id":"CVE-2026-72769","ts":1789761005647,"field":"severity","old":"none","new":"high"}]}