CVE-2026-12940

Published: Jul 30, 2026Modified: Aug 4, 2026

9.8

Vector

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

Exploitability: 3.9 / Impact: 5.9

Source: psirt@us.ibm.com (Secondary)

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 (1)

Products: Langflow: Langflow

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Langflow Langflow	From 1.0.0 to 1.10.2

Related CWEs

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

References (1)

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

Source: psirt@us.ibm.com

Vendor Advisory

Timeline

No history available yet.