CVE-2026-12940
Langflow is affected by remote code execution due to multiple unauthenticated and insufficiently authorized API endpoints
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-78 |
| Vendor | ibm |
| Product | langflow oss |
| Published | Jul 30, 2026 |
| Last Updated | Jul 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
IBM / Langflow OSS
1.0.0 ≤ 1.10.1