Is n8n affected by CVE-2026-42236?

npm n8n is affected in =2.18.0 =2.0.0 <2.17.4.

Is CVE-2026-42236 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

high

CVE-2026-42236

Q: Is CVE-2026-42236 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

npm · n8n

Summary

n8n Vulnerable to Unauthenticated Denial of Service via MCP Client Registration

Severity: high
EPSS: 0.5% (p37)
Also known as: GHSA-49m9-pgww-9vq6
Published: 2026-04-29

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-49m9-pgww-9vq6
https://nvd.nist.gov/vuln/detail/CVE-2026-42236
https://github.com/n8n-io/n8n

Related advisories

CVE-2026-44791 — critical · npm/n8n
CVE-2026-44790 — critical · npm/n8n
CVE-2026-44789 — critical · npm/n8n
CVE-2026-42232 — critical · npm/n8n
CVE-2026-42231 — critical · npm/n8n
CVE-2025-68613 — critical · npm/n8n
CVE-2026-54304 — high · npm/n8n
CVE-2026-54309 — high · npm/n8n

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.