CVE-2026-12940

CRITICAL

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

Title source: cna

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.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory patch

https://www.ibm.com/support/pages/node/7279995

Scores

CVSS v3 9.8

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

CWE

CWE-78

Status published

Products (1)

IBM/Langflow OSS 1.0.0 - 1.10.1

Published Jul 30, 2026

Tracked Since Jul 30, 2026