Prototype Pollution in N8n
CVE-2026-72769
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 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.
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.003
Affected products
- N8n — versions 2.32.0
- N8n-Io N8n — versions 0, 1.123.67, 2.32.1
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-hx4h-vr3m-45vh (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-vm-expression-e… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-72769?
- CVE-2026-72769 is a high-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.1/10. Published 2026-08-11.
- How severe is CVE-2026-72769?
- High severity. CVSS v3 base score is 8.1 out of 10.