CVE-2026-86083 n8n: Expression Sandbox Escape via Shared Builtin Tampering and Code-Printer Injection Leads to Code Execution
Attackers can execute arbitrary code in n8n by tampering with builtins to inject malicious code into generated expressions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-86083?
CVE-2026-86083 is a high-severity code injection vulnerability in N8n N8n, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-94
Which versions are affected by CVE-2026-86083?
6 open source packages ship an affected version, including n8n. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
n8n npm | All versions | 1.123.76 |
n8n npm | All versions | 1.123.76 |
n8n npm | From 2.0.0 | 2.37.7 |
n8n npm | From 2.0.0 | 2.37.7 |
n8n npm | From 2.38.0 | 2.38.2 |
n8n npm | From 2.38.0 | 2.38.2 |
Products include N8n N8n.
How do I fix CVE-2026-86083?
Upgrade n8n to a fixed version for your release line: 1.123.76, 2.37.7 or 2.38.2.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-86083 being exploited?
There is no known exploitation of CVE-2026-86083 in the wild and no public exploit code.
Other vulnerabilities in N8n N8n
- CVE-2025-68613 n8n Improper Control of Dynamically-Managed Code Resources
- CVE-2026-21877 n8n is vulnerable to Remote Code Execution via Arbitrary File Write
- CVE-2026-21858 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling
- CVE-2026-1470 n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution
- CVE-2025-68668 n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node
Sources
Also known as GHSA-6xcw-7xm6-48c6, MINI-vf72-m2jm-7fm4, ROOT-APP-NPM-CVE-2026-86083.