Prototype Pollution in N8n
CVE-2026-72749
n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the Edit Fields (Set) node. The node assigns output fields via a dot-notation path setter without restricting the field name, allowing an authenticated user to name a field after an inherited built-in method path and corrupt a shared global in the main Node.js process. Because that global is used on the request-authentication path, the instance then fails every authenticated request, causing an instance-wide denial of service for all users until the process is restarted.
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.0% 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: 0.006 · 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-xwx6-jjhv-84p8 (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/n8n-before-prototype-pollution-via-edit-fields (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-72749?
- CVE-2026-72749 is a medium-severity vulnerability in N8n, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 6.5/10. Published 2026-08-11.
- How severe is CVE-2026-72749?
- Medium severity. CVSS v3 base score is 6.5 out of 10.