---
title: "CVE-2026-27495: n8n has a Sandbox Escape in its JavaScript Task Runner"
url: https://erroneo.us/security/cve/CVE-2026-27495/
description: "CVE-2026-27495 (n8n (npm)): n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-02-25
date_modified: 2026-02-27
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-27495"
kev: false
cvss: 9.4
epss: 0.00842
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-27495: n8n has a Sandbox Escape in its JavaScript Task Runner

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.8% , percentile 57: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 57% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes n8n (npm) < 1.123.22, fixed in 1.123.22 ; n8n (npm) >= 2.0.0, < 2.9.3, fixed in 2.9.3 ; n8n (npm) >= 2.10.0, < 2.10.1, fixed in 2.10.1 . Check your lockfile, including transitive dependencies.

## What it is

n8n is an open source workflow automation platform. Prior to versions 2.10.1, 2.9.3, and 1.123.22, an authenticated user with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary. On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner. Task Runners must be enabled using N8NRUNNERSENABLED=true. The issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations. Limit workflow creation and editing permissions to fully trusted users only, and/or use external runner mode (N8NRUNNERSMODE=external) to limit the blast radius. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

## Affected packages

- npm `n8n` < 1.123.22 → fixed: 1.123.22
- npm `n8n` >= 2.0.0, < 2.9.3 → fixed: 2.9.3
- npm `n8n` >= 2.10.0, < 2.10.1 → fixed: 2.10.1

## Affected products (CVE record)

- n8n-io n8n: < 1.123.22, >= 2.0.0, < 2.9.3, >= 2.10.0, < 2.10.1

## Severity

- GitHub_M CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`
- GitHub CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.84% probability of exploitation activity in the next 30 days; percentile 57.

## Sources

- [GitHub Advisory GHSA-jjpj-p2wh-qf23](https://github.com/advisories/GHSA-jjpj-p2wh-qf23)
- [CVE.org record CVE-2026-27495](https://www.cve.org/CVERecord?id=CVE-2026-27495)
- [NVD entry CVE-2026-27495](https://nvd.nist.gov/vuln/detail/CVE-2026-27495)
- [github.com](https://github.com/n8n-io/n8n/security/advisories/GHSA-jjpj-p2wh-qf23)
- [docs.n8n.io](https://docs.n8n.io/hosting/configuration/task-runners)
- [github.com](https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.22)
- [github.com](https://github.com/n8n-io/n8n/releases/tag/n8n@2.10.1)
- [github.com](https://github.com/n8n-io/n8n/releases/tag/n8n@2.9.3)

---
Source page: https://erroneo.us/security/cve/CVE-2026-27495/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt