Vulnerability · Published Sep 8, 2026 · Assigned by GitHub_M
CVE-2026-86083n8n: Expression Sandbox Escape via Shared Builtin Tampering and Code-Printer Injection Leads to Code Execution
High 7.7
In plain English
A high-severity code injection in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | n8n | 1.123.76 | GHSA-6xcw-7xm6-48c6 |
| npm | n8n | 2.38.2 | GHSA-6xcw-7xm6-48c6 |
| npm | n8n | 2.37.7 | GHSA-6xcw-7xm6-48c6 |
Affected products (as reported)
Weakness: CWE-94 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-6xcw-7xm6-48c6 x_refsource_CONFIRM
- https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76 x_refsource_MISC
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7 x_refsource_MISC
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2 x_refsource_MISC