CVE-2026-12940

—

CVSS 3.1

9.8 critical

EPSS

<1%p50

Published

Jul 30, 2026 (Jul 30, 2026)

Modified

Aug 4, 2026

Description

IBM Langflow OSS 1.0.0 through 1.10.1 are vulnerable to unauthenticated remote code execution via environment variable injection in the MCP (Model Context Protocol) stdio launcher. The vulnerability exists in src/lfx/src/lfx/base/mcp/util.py where the DANGEROUS_ENV_VARS blocklist fails to include SHELLOPTS , BASHOPTS , and PS4 environment variables.

Vendors: langflow
Products: langflow
Weakness: CWE-78
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.7%)

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