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Critical · 9.8 Public exploit CVE-2026-12940 EUVD-2026-51240GHSA-gx45-8jc3-gqqr

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

Published Jul 30, 2026 · Updated Jul 31, 2026 · Assigned by ibm

Vendor: IBM Product: Langflow OSS

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.

Affected products

VendorProductAffectedFixed
IBM Langflow OSS 1.0.0 – ≤ 1.10.1 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • BiiTts/CVE-2026-12940-Langflow-Unauth-RCE ★ 4 · Aug 3, 2026

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

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 1

References