high8.8
CVE-2026-86076
n8n: Expression Sandbox Escape via Class-Field Sanitizer Rebinding Can Lead to Code Execution
Impact
n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the expression compiler sanitizer resolved through dynamically scoped this and did not reject reserved class member names. A class field named __sanitize could rebind the sanitizer and reach the Function constructor, enabling backend code execution and editor-preview JavaScript execution. The affected AST hook is PrototypeSanitizer in packages/workflow/src/expression-sandboxing.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | n8n | < 1.123.76 | 1.123.76 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| N8n | N8n | before 1.123.76 from 2.0.0 before 2.37.7 from 2.38.0 before 2.38.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-hw8v-xxg5-vvvx
- https://github.com/n8n-io/n8n/security/advisories/GHSA-hw8v-xxg5-vvvx
- https://nvd.nist.gov/vuln/detail/CVE-2026-86076
- https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2