CVE-2026-51886

Received Received - Intake

Code Injection in Langflow AI v1.9.3

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: MITRE

Description

langflow-ai langflow v1.9.3 is affected by: Code Injection. The impact is: execute arbitrary code (remote). The component is: src/backend/base/langflow/api/v1/validate.py:validate-post_validate_code-a-real-authenticated-http-post-to-api-v1. The attack vector is: Attack surface: HTTP or browser-backed service path. A public-facing route accepts raw Python source and forwards it into a server-side compile/exec validation path without any visible entitlement guard. ¶¶ A weakness has been identified in langflow-ai langflow up to 1.9.3. langflow contains a code injection vulnerability in validate-post_validate_code-a-real-authenticated-http-post-to-api-v1 (src/backend/base/langflow/api/v1/validate.py:13). An authenticated attacker can execute arbitrary Python code on the server by submitting malicious code to the /api/v1/validate/code endpoint, which directly executes user-supplied code without sandboxing or security controls.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-01

Last Modified

2026-10-01

Generated

2026-10-02

AI Q&A

2026-10-02

EPSS Evaluated

N/A

NVD

CVE-2026-51886

Affected Vendors & Products

Vendor	Product	Version / Range
langflow-ai	langflow	to 1.9.3 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is a code injection flaw in langflow-ai langflow version 1.9.3. An authenticated attacker can send malicious Python code to the /api/v1/validate/code endpoint, which executes the code directly on the server without any sandboxing or security controls.

Detection Guidance

To detect this vulnerability, check if your langflow instance is running version 1.9.3 or earlier. Inspect network traffic for POST requests to the /api/v1/validate/code endpoint. Look for authenticated HTTP POST requests containing raw Python source code being sent to this endpoint.

Impact Analysis

An attacker could exploit this to execute arbitrary code on the server, potentially leading to unauthorized access, data theft, system compromise, or disruption of services. The impact is severe as it allows full control over the affected system.

Compliance Impact

This vulnerability likely violates compliance requirements for GDPR and HIPAA due to unauthorized code execution risks. It could lead to data breaches, loss of confidentiality, and failure to meet security control standards.

Mitigation Strategies

Immediately upgrade langflow to a version that patches this vulnerability. If upgrading is not possible, restrict access to the /api/v1/validate/code endpoint by implementing authentication and authorization controls. Disable or remove the vulnerable endpoint if not required.

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