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CVE WatchJul 30, 2026

CVE-2026-12940

IBM Langflow OSS 1.0.0 through 1.10.1  are vulnerable to unauthenticated remote code execution via environment variable injection in the MCP

CVSS

9.8

Critical

EPSS

KEV

Exploit Today

0-100

Published: Jul 30, 2026 · Last modified: Jul 30, 2026 · CWE-78

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references
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