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CVE-2026-42236

🗓️ 04 May 2026 18:38:51Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 12 Views

Unauthenticated MCP client registration can exhaust memory and crash n8n, even when MCP is disabled.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-42236
4 May 202618:38
attackerkb
Circl
CVE-2026-42236
4 May 202620:56
circl
CNNVD
n8n 安全漏洞
4 May 202600:00
cnnvd
Cvelist
CVE-2026-42236 n8n: Unauthenticated Denial of Service via MCP Client Registration
4 May 202618:38
cvelist
EUVD
EUVD-2026-27111
4 May 202618:38
euvd
Github Security Blog
n8n Vulnerable to Unauthenticated Denial of Service via MCP Client Registration
29 Apr 202621:19
github
NVD
CVE-2026-42236
4 May 202619:16
nvd
OSV
GHSA-49M9-PGWW-9VQ6 n8n Vulnerable to Unauthenticated Denial of Service via MCP Client Registration
29 Apr 202621:19
osv
Positive Technologies
PT-2026-36906
29 Apr 202600:00
ptsecurity
RedhatCVE
CVE-2026-42236
5 Jun 202619:16
redhatcve
Rows per page
NVD
Vulners
Node
n8nn8nRange<1.123.32enterprisenode.js
OR
n8nn8nRange2.17.02.17.4enterprisenode.js
OR
n8nn8nMatch2.18.0enterprisenode.js
[
  {
    "vendor": "n8n-io",
    "product": "n8n",
    "versions": [
      {
        "version": "< 1.123.32",
        "status": "affected"
      },
      {
        "version": ">= 2.17.0, < 2.17.4",
        "status": "affected"
      },
      {
        "version": ">= 2.18.0, < 2.18.1",
        "status": "affected"
      }
    ]
  }
]

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17 Jun 2026 10:47Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.17.5
CVSS 48.7
EPSS0.00469
SSVC
12