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CVE-2026-12940

CriticalPublished

Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints

Published: Jul 30, 2026
Updated: Jul 31, 2026
Assigning CNA: ibm
Evidence observed: Aug 10, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 50.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-12940-Langflow-Unauth-RCEExploit
CVE-2026-12940 — Langflow OSS <=1.10.1 unauthenticated RCE via MCP stdio environment-variable injection (SHELLOPTS/PS4). Author PoC + source analysis + lab.

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