n8n JavaScript Task Runner sandbox escape
CVE-2026-27495 is a critical sandbox escape vulnerability in n8n's JavaScript Task Runner. In n8n versions prior to 2.10.1, 2.9.3, and 1.123.22, an authenticated user who has permission to create or modify workflows can exploit a code injection flaw in the JavaScript Task Runner sandbox to execute arbitrary code outside the intended sandbox boundary. The issue affects deployments where Task Runners are enabled via N8N_RUNNERS_ENABLED=true. On instances using the default internal Task Runner mode, successful exploitation can lead to arbitrary code execution on the underlying n8n host. On instances using external Task Runners, exploitation may impact the runner environment and other tasks executed there.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
N8N_RUNNERS_MODE=external to reduce the blast radius compared with the default internal runner mode. These measures are temporary only and do not fully remediate the vulnerability.Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A code injection vulnerability in n8n's JavaScript Task Runner sandbox that allows an authenticated user with workflow creation or modification permissions to execute arbitrary code outside the sandbox boundary.
A critical n8n vulnerability that enables sandbox escape and, in default configurations, can lead to full compromise of the underlying host.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.