Unrated severityNVD Advisory· Published Jul 30, 2026· Updated Jul 31, 2026
Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints
CVE-2026-12940
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.
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Affected products
1- Range: 1.0.0 - 1.10.1
Patches
Vulnerability mechanics
References
1- www.ibm.com/support/pages/node/7279995mitrevendor-advisorypatch
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