CVE-2026-12940

critical · 9.8

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.

9.8

CVSS

0.7%

EPSS (exploit prob.)

51st

EPSS percentile

2026-07-30

Published

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

Weaknesses

CWE-78

Affected products

Vendor	Product	Affected versions
langflow	langflow	>= 1.0.0, < 1.10.2

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-12940