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CVE-2026-12940

🗓️ 30 Jul 2026 16:41:54Reported by ibmType 
cve
 cve
🔗 web.nvd.nist.gov👁 117 Views🌐 WEB

Langflow remote code execution via unauthenticated endpoints and environment variable injection in MCP.

Related
Detection
Affected
Refs
Paths
NVD
Vulners
Node
langflowlangflowRange1.0.01.10.2
[
  {
    "vendor": "IBM",
    "product": "Langflow OSS",
    "versions": [
      {
        "status": "affected",
        "version": "1.0.0",
        "lessThanOrEqual": "1.10.1",
        "versionType": "semver"
      }
    ],
    "cpes": [
      "cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*",
      "cpe:2.3:a:ibm:langflow_oss:1.10.1:*:*:*:*:*:*:*"
    ]
  }
]
ParameterPositionPathDescriptionCWE
envrequest bodyapi/v2/mcp/servers/{name}OS command injection via environment variable values in MCP server registrationCWE-78
commandrequest bodyapi/v2/mcp/servers/{name}OS command injection via environment variable values in MCP server registrationCWE-78
argsrequest bodyapi/v2/mcp/servers/{name}OS command injection via environment variable values in MCP server registrationCWE-78
action_countquery paramapi/v2/mcp/servers?action_count=trueTrigger MCP stdio launcher to spawn a shell and execute PS4 payload via the already-registered serverCWE-78

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04 Aug 2026 20:20Current
6.5Medium risk
Vulners AI Score6.5
CVSS 3.19.8
EPSS0.00684
SSVC
117