CVE-2026-42449: n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operati

Routine

HIGH 8.5UPGRADE

CVE-2026-42449 is a high-severity flaw (CVSS 8.5) affecting n8n-mcp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. In versions 2.47.4 through 2.47.13, the SDK embedder path (N8NDocumentationMCPServer constructor, getN8nApiClient(), and validateInstanceContext()), the synchronous URL validator in SSRFProtection.validateUrlSync() had no IPv6 checks. IPv4-mapped IPv6 addresses such as http://[::ffff:169.254.169.254] bypassed the cloud-metadata, loca

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-05-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: n8n-mcp

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-07 21:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

n8n-mcp n8n-mcp UPGRADE

Affected: >= 2.47.4 and < 2.47.14

Fixed in: 2.47.14

Safe to downgrade to: a release before 2.47.4

1. Check installed version

apt-cache policy n8n-mcp || rpm -q n8n-mcp || n8n-mcp --version

2. UPGRADE to 2.47.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade n8n-mcp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade n8n-mcp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.47.4 (Debian / Ubuntu)

apt-cache madison n8n-mcp sudo apt install n8n-mcp=<VERSION_BEFORE_2.47.4> sudo apt-mark hold n8n-mcp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list n8n-mcp sudo dnf downgrade n8n-mcp-<VERSION_BEFORE_2.47.4> sudo dnf versionlock add n8n-mcp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42449?

n8n-mcp: upgrade to 2.47.14. Exact commands for each OS are on this page.

Is CVE-2026-42449 being exploited?

CVE-2026-42449 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42449 affect?

CVE-2026-42449 affects n8n-mcp. Severity is high (CVSS 8.5). n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. In versions 2.47.4 through 2.47.13, the SDK embedder path (N8NDocumentationMCPServer constructor, getN8nApiClient(), and vali

How urgent is CVE-2026-42449?

Priority 32/100. High severity

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CVE-2026-42282 MEDIUM 4.3 UPGRADE n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operati
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References

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