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High severity8.8NVD Advisory· Published Sep 8, 2026· Updated Sep 11, 2026

CVE-2026-86076

CVE-2026-86076

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
n8nnpm
< 1.123.761.123.76
n8nnpm
>= 2.38.0, < 2.38.22.38.2
n8nnpm
>= 2.0.0, < 2.37.72.37.7

Affected products

1
  • N8n Io/N8nllm-fuzzy
    Range: pre-1.123.76, pre-2.37.7, pre-2.38.2

Patches

Vulnerability mechanics

References

6

News mentions

1