RCE in N8n
CVE-2026-86083
n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the legacy expression engine generated source text by calling the mutable global JSON.stringify while printing synthetic string literals and interpolating timezone data. An expression could replace JSON.stringify and cause later generated source to contain executable attacker-controlled code. The affected code-generation paths include packages/@n8n/expression-runtime/src/bridge/isolated-vm-bridge.ts and packages/@n8n/tournament/src/ExpressionBuilder.ts, and the issue does not affect the vm expression engine. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- N8n
- N8n-Io N8n — versions < 1.123.76, >= 2.0.0, < 2.37.7, >= 2.38.0, < 2.38.2
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-6xcw-7xm6-48c6 (Mitigation, Vendor Advisory)
- github.com/n8n-io/n8n/releases/tag/n8n@1.123.76 (Release Notes)
- github.com/n8n-io/n8n/releases/tag/n8n@2.37.7 (Release Notes)
- github.com/n8n-io/n8n/releases/tag/n8n@2.38.2 (Release Notes)
Frequently asked questions
- What is CVE-2026-86083?
- CVE-2026-86083 is a high-severity vulnerability in N8n, classified under Code Injection. CVSS score: 8.8/10. Published 2026-09-08.
- How severe is CVE-2026-86083?
- High severity. CVSS v3 base score is 8.8 out of 10.