Langflow <=1.2.x - Unauthenticated Remote Code Execution via validate_code
CVE-2026-0768
Verified
Description
Langflow <= 1.2.x exposes POST /api/v1/validate/code without any authentication. The endpoint calls validate_code() which exec()s user-supplied Python code. Default-argument expressions in Python execute at function-definition time, allowing arbitrary OS command execution without authentication.
Severity
Critical
CVSS Score
9.8
Exploit Probability
23%
Affected Product
langflow
Published Date
September 15, 2026
Template Author
dhiyaneshdk
CVE-2026-0768.yaml
9.8Score
CVSS Metrics
CVSS Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE ID:
cve-2026-0768
CWE ID:
cwe-94
Remediation Steps
Upgrade Langflow to a version that requires authentication on the validate/code endpoint.