Disclosed vulnerability
Ni8mare and N8scape: Rapid7 discloses a CVSS 10.0 arbitrary file read and a Pyodide sandbox bypass in n8n
AIR-2026-0004 AIR record · 2026-01-n8n-ni8mare-n8scape-cluster
From the supporting source
Certain form-based workflows are vulnerable to improper file handling that can result in arbitrary file read.rapid7.com
The record
Disclosed
2026-01-07
Vendor
n8n GmbH
Product
n8n
Risk domain
Access control and permissions › Privilege escalation
System type
Generative model
Who acted
AI was the target — CVSS 10.0 arbitrary file read and Pyodide sandbox bypass in n8n
Attack surface
Agent framework
Autonomy level
Semi-autonomous
Initial vector
Crafted form upload and python code node
Impact type
Arbitrary file read, Privilege escalation, Remote code execution, Sandbox escape
Confidence
High
Submitted by
EAI Internal
Crosswalk
- OWASP Agentic Top 10 (2026)
- ASI03 – Identity and Privilege Abuse
- MITRE ATLAS
- AML.T0055 – Unsecured Credentials
- NIST AI RMF
- GOVERN 6.1
- EU AI Act
- Article 13
- ISO/IEC
- TR 24028; 42001; 23894
- AIUC-1
- B. Security
- Scope
- tool misuse
- Mitigation
- Apply least-privilege principle; Regular policy audits.
- Taxonomy
- Enkrypt AI agent risk taxonomy · Black-Box Red Teaming of Agentic AI: A Taxonomy-Driven Framework for Automated Risk Discovery
Blast radius
n8n 1.65.0 to < 1.121.0 (Ni8mare); the platform had 100,000+ internet-exposed instances counted by Censys in the same window
Capability abused
Defense & remediation
Recorded defense
Pyodide-based Python code node sandbox; content-type validation on form uploads
Guardrail kinds
Sandbox isolation
Guardrail outcome
Silent
Fix shipped
n8n 1.121.0 (CVE-2026-21858), 1.121.3 (CVE-2026-21877), 2.0.0 (CVE-2025-68668, CVE-2025-68697)
Taxonomy & references
Curator notes
Rapid7 disclosure. CVE-2026-21858 'Ni8mare' CVSS 10.0 (arbitrary file read escalating to n8n administrator access), CVE-2026-21877 CVSS 9.9 (authenticated untrusted code execution), CVE-2025-68668 'N8scape' CVSS 9.9 (sandbox bypass in the Pyodide Python Code node), CVE-2025-68697 CVSS 5.4 (internal helper functions reachable from the Code node). Grouped as one Rapid7 disclosure cluster. Separate from CVE-2025-68613, which is its own record because it was independently exploited and reached CISA KEV. Rapid7's table lists CVE-2025-68613 fixed in 1.20.4 where n8n's own advisory says 1.120.4 - the n8n advisory is authoritative.
Supporting sources
Cite as
Enkrypt AI. "Ni8mare and N8scape: Rapid7 discloses a CVSS 10.0 arbitrary file read and a Pyodide sandbox bypass in n8n". AIR, AIR-2026-0004. https://agentincident.vercel.app/i/AIR-2026-0004/ (accessed 2026-10-19).