# CVE-2026-65591: n8n code execution via sanitizer bypass in legacy expression evaluator

Source: https://junglewise.ai/threats/cve-2026-65591-n8n-code-execution-via-sanitizer-bypass-in-legacy-expression  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-22. Updated: 2026-07-22  
License: CC BY 4.0 with a link back

CVE-2026-65591 · Severity: high · CVSS 4 · Published 2026-07-22

n8n is a popular workflow automation tool used to connect various business applications and services. A security flaw in its legacy expression engine allows an authorized user to bypass safety filters and execute unauthorized commands on the underlying server. This could lead to a complete takeover of the n8n instance, potentially exposing sensitive credentials and automated business data.

Technologies: [N8n](https://junglewise.ai/threats/technologies/n8n), [n8n (npm)](https://junglewise.ai/threats/technologies/npm-n8n). Vendors: [N8n](https://junglewise.ai/threats/vendors/n8n), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-65591 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-65591 being exploited in the wild.

**How severe is CVE-2026-65591?** High severity, with a CVSS score of 4, published 22 July 2026.

**Which products and versions are affected?** N8n < 1.123.64, < 2.29.8, < 2.30.1, < 1.123.64, >= 2.0.0-rc.0 < 2.29.8, >= 2.30.0 < 2.30.1; n8n (npm) SEMVER:introduced=0,fixed=1.123.64.

**Is there a fix for CVE-2026-65591?** Yes. n8n (npm): upgrade to 1.123.64 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-65591 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-65591?** Check whether you run N8n or n8n (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- n8n (npm): upgrade to 1.123.64 or later

  ```sh
  npm install n8n@1.123.64
  ```


## Technical details

A vulnerability exists in n8n's legacy expression evaluator where the computed-member sanitizer can be bypassed. This is classified as an Expression Language Injection (CWE-917). An authenticated attacker with permissions to create or modify workflows can craft a malicious expression that escapes the sandbox, leading to host-level code execution as the n8n process. The legacy engine is the default in affected versions. The issue is resolved in versions 1.123.64, 2.29.8, and 2.30.1. A temporary workaround involves switching the expression engine to 'vm' via environment variables.

## Affected products

- n8n-io n8n < 1.123.64, >= 2.0.0-rc.0 < 2.29.8, >= 2.30.0 < 2.30.1

## Identifiers

- CVE-2026-65591
- GHSA-pm35-fqvh-cq5g

## Timeline

- 2026-07-08: disclosed: Initial report by Junming Wu (Dremig)
- 2026-07-22: advisory: GitHub Advisory published

## References

- [https://api.github.com/users/Dremig](https://api.github.com/users/Dremig)
- [https://github.com/Dremig](https://github.com/Dremig)
- [https://api.github.com/users/Dremig/gists%7B/gist_id%7D](https://api.github.com/users/Dremig/gists%7B/gist_id%7D)
- [https://api.github.com/users/Dremig/repos](https://api.github.com/users/Dremig/repos)
- [https://avatars.githubusercontent.com/u/145779217?v=4](https://avatars.githubusercontent.com/u/145779217?v=4)
- [https://api.github.com/users/Dremig/events%7B/privacy%7D](https://api.github.com/users/Dremig/events%7B/privacy%7D)

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