CVE-2026-12940
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Langflow
PublishedJul 30, 2026
First seenJul 30, 2026
Weakness typeCWE-78OS command injection
How to fix
Update
- langflow langflow1.10.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| langflow langflow | 1.0.0 ≤ v < 1.10.2 | 1.10.2 |
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