gist.github.com Critical RCE Vulnerability in Langflow's Code Validation Endpoint
Article Content
- •CVE-2026-51886 allows RCE via Langflow's code validation endpoint.
- •Affected versions include Langflow up to 1.9.3; patched in 1.10.1.
- •Attackers can execute arbitrary Python code with backend privileges.
A critical Authenticated Remote Code Execution (RCE) vulnerability, tracked as CVE-2026-51886, has been identified in Langflow's validate_code function. The /api/v1/validate/code endpoint allows authenticated users to submit arbitrary Python code, which is executed server-side via Python's exec() function without proper security controls. This flaw enables attackers to execute malicious code, leading to potential system compromise. The vulnerability affects Langflow versions up to 1.9.3 and was patched in version 1.10.1. Prior to the fix, the endpoint had no authentication until a commit in September 2026. The vulnerability was disclosed on October 1, 2026, with a CVSS score of 9.8, indicating a critical severity level. Security professionals are urged to update to the latest version to mitigate risks.
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