Vulnerability · Published Feb 25, 2026 · Assigned by GitHub_M
CVE-2026-27495n8n has a Sandbox Escape in its JavaScript Task Runner
Critical 9.4
In plain English
A critical-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 0.8% (higher than 57% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
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 `N8N_RUNNERS_ENABLED=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 (`N8N_RUNNERS_MODE=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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | n8n | 1.123.22 | GHSA-jjpj-p2wh-qf23 |
| npm | n8n | 2.9.3 | GHSA-jjpj-p2wh-qf23 |
| npm | n8n | 2.10.1 | GHSA-jjpj-p2wh-qf23 |
Affected products (as reported)
Weakness: CWE-94 · Vector: 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
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-jjpj-p2wh-qf23 x_refsource_CONFIRM
- https://docs.n8n.io/hosting/configuration/task-runners x_refsource_MISC
- https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.22 x_refsource_MISC
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.10.1 x_refsource_MISC
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.9.3 x_refsource_MISC