Remote Code Execution Vulnerability in IBM Langflow
CVE-2026-12940

9.8CRITICAL

Key Information:

Vendor

IBM
Status
Langflow Oss
Vendor
CVE Published:
30 July 2026

What is CVE-2026-12940?

IBM Langflow OSS versions 1.0.0 through 1.10.1 are exposed to a remote code execution vulnerability due to improper handling of environment variables in the MCP (Model Context Protocol) stdio launcher. Specifically, the vulnerability lies in the failure of the software to include critical variables like SHELLOPTS, BASHOPTS, and PS4 in its DANGEROUS_ENV_VARS blocklist, potentially allowing attackers to execute arbitrary code without authentication.

Affected Version(s)

Langflow OSS 1.0.0 <= 1.10.1

References

https://www.ibm.com/support/pages/node/7279995
vendor-advisorypatch

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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