CVE-2026-42449Network attack vector

SSRF via missing IPv6 validation

Published May 7, 2026 · Updated May 7, 2026

SSRF in n8n-MCP 2.47.4 through 2.47.13 allows remote authenticated users to reach internal services via a crafted n8nApiUrl. SSRFProtection.validateUrlSync() omits IPv6 checks, so IPv4-mapped IPv6 literals bypass metadata, localhost, and private-range filtering. Reachability requires an SDK embedder to accept a user-controlled InstanceContext; responses return to the caller and the n8n API key is forwarded to the selected target.

CVSS severity8.5
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in n8n-MCP 2.47.4 through 2.47.13 allows remote authenticated users to reach internal services via a crafted n8nApiUrl. SSRFProtection.validateUrlSync() omits IPv6 checks, so IPv4-mapped IPv6 literals bypass metadata, localhost, and private-range filtering. Reachability requires an SDK embedder to accept a user-controlled InstanceContext; responses return to the caller and the n8n API key is forwarded to the selected target.

The record

CVE
CVE-2026-42449
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Ai Advisors Romuald Czlonkowski
Product
n8n-MCP
Classifications
CWE-918, T1552.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.47.4, < 2.47.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ai Advisors Romuald Czlonkowski · n8n-MCPversion=>= 2.47.4, < 2.47.14

Published CVSS scores

8.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1552.005Cloud Instance Metadata API

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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