External risk intelligence

Langflow Code Injection Vulnerability

CVE advisoryKnown Exploit

CVE-2025-3248

A code injection vulnerability in Langflow allows unauthenticated attackers to execute arbitrary code. This could lead to unauthorized system access and control, presenting a notable business risk. Organizations should identify affected assets and take action to mitigate exposure.

4Halo Surface Signal

Missing Authentication

Langflow

before 1.3.0

External exposure likelihood

Halo Surface Signal score for CVE-2025-3248

Langflow is a web-based platform typically deployed as a network-accessible service. The vulnerability exists in a primary API endpoint (/api/v1/validate/code) reachable by unauthenticated remote users. Given the service's design for API consumption and external workflow integration, it is highly likely to be exposed in environments where the service is hosted.

Horizon Alert

Summary of the vulnerability and why it matters

The Langflow application contains a vulnerability within its code validation API. This flaw permits unauthenticated remote attackers to execute arbitrary code on the affected system. The potential impact includes unauthorized system access and control, leading to significant business risk.

  • Vulnerable code validation API
  • Allows arbitrary code execution
  • Creates unauthorized system control

Attack Path

How an attacker could exploit the issue

An attacker can exploit a code injection vulnerability in the Langflow API to execute arbitrary code. This attack requires an exposed API endpoint and can be initiated by sending specially crafted HTTP requests without authentication. Successful exploitation allows an attacker to gain control over the affected system.

  • Exposed API endpoint
  • Unauthenticated HTTP request
  • Arbitrary code execution

Live Threat

Current exploitation, exposure, and threat context

The organization faces a critical threat due to a code injection vulnerability in Langflow. Attackers can exploit this vulnerability remotely without authentication to execute arbitrary code, posing a significant risk to systems and data. Prompt action is necessary to mitigate potential damage.

  • Attackers with low skill levels.
  • Remote, unauthenticated access required.
  • Business risk is critical and urgent.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability allows unauthenticated remote attackers to execute arbitrary code through crafted HTTP requests to the /api/v1/validate/code endpoint. Organizations using affected versions of Langflow should prioritize actions to protect their systems and data. The vulnerability's critical severity and network exploitability indicate a significant risk to affected business operations.

  • Find affected Langflow assets.
  • Reduce exposure or isolate risk.
  • Fix, verify, and monitor.

Frequently asked questions

What is the primary vulnerability in Langflow versions prior to 1.3.0?

Langflow versions earlier than 1.3.0 have a code injection vulnerability in the /api/v1/validate/code endpoint. This allows unauthenticated remote attackers to run their own code by sending specially crafted HTTP requests. This weakness is classified under CWE-306 and CWE-94, indicating a flaw related to authentication bypass and code writing.

How can an attacker exploit the Langflow vulnerability?

An attacker can exploit this vulnerability by sending unauthenticated HTTP requests to the /api/v1/validate/code endpoint on affected Langflow installations. These requests contain crafted code that the API then executes, leading to arbitrary code execution on the server. The attack vector is over the network (AV:N) with low complexity (AC:L) and no privileges required (PR:N).

What is the impact of the Langflow code injection vulnerability?

The impact of this vulnerability is critical, with a CVSS v3.1 base score of 9.8. Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code, leading to complete compromise of the affected system. This can result in unauthorized access, data theft, or further system compromise.

How can organizations address the Langflow code injection vulnerability?

Organizations should prioritize upgrading Langflow to version 1.3.0 or later to fix this vulnerability. If an immediate upgrade is not possible, reducing the exposure of the /api/v1/validate/code endpoint or isolating affected systems can help mitigate the risk. Monitoring for suspicious activity on these endpoints is also recommended. This vulnerability was listed on the CISA Known Exploited Vulnerabilities (KEV) catalog on May 5, 2025.

Why is Langflow considered a likely exposed service for this vulnerability?

Langflow is a web-based platform often deployed as a network-accessible service. The vulnerability is in a core API endpoint that can be reached by unauthenticated remote users. Given its typical use for API consumption and external workflow integration, it's highly probable that Langflow instances are exposed in environments where they are hosted, making this vulnerability a significant concern.

References