EQSTLab/CVE-2025-3248

GitHubRepository PoCExploit

PoC files

2 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

Python script that sends a crafted POST request to the /api/v1/validate/code endpoint of a Langflow instance to achieve remote code execution via a code injection vulnerability (CVE-2025-3248).

Backdoor review

No backdoor observed in reviewed code

The PoC is a straightforward Python script that sends a crafted payload to the vulnerable /api/v1/validate/code endpoint of a Langflow instance to achieve remote code execution, consistent with the described CVE-2025-3248. No concealed backdoor, unrelated payload, persistence mechanism, or credential theft was observed. The script's behavior is limited to executing the user-supplied command on the target server and printing the output.

ClassificationExploit
Model confidence95%
AuthenticationNot required
LanguagesPython
Target softwareLangflow
Attack typescode injectionremote code execution
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The script actively sends a payload designed to execute arbitrary commands on the target system and retrieves the output, which constitutes exploitation rather than mere detection or scanning.

CVE-2025-3248.py:67-105CVE-2025-3248.py:2

Requirements

  • Target must be a Langflow instance version < 1.3.0 with the /api/v1/validate/code endpoint exposed.CVE-2025-3248.py:69README.md:15
  • Attacker must be able to reach the target over HTTP(S).CVE-2025-3248.py:84-85

Observed behavior

  • Constructs a JSON payload containing a Python function definition with a default argument that executes a shell command via subprocess.check_output.CVE-2025-3248.py:72-80
  • Sends an HTTP POST request with the payload to the target's /api/v1/validate/code endpoint.CVE-2025-3248.py:84-85
  • Parses the JSON response to extract command output from error messages.CVE-2025-3248.py:95-102
  • Prints the extracted command output to stdout.CVE-2025-3248.py:119-121
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Exploit Mechanism
Code injection via default argument in Python function definitionThe payload constructs a Python function definition where the default argument value calls exec() with a subprocess command, exploiting the code validation endpoint to achieve RCE.CVE-2025-3248.py:74
Network Target
/api/v1/validate/code endpoint on user-supplied targetThe script sends a POST request to the vulnerable endpoint with the malicious payload.CVE-2025-3248.py:69CVE-2025-3248.py:84-85
Command Execution
User-supplied command executed via subprocess.check_outputThe script takes a command from the command line and injects it into the payload, which is then executed on the target server.CVE-2025-3248.py:74CVE-2025-3248.py:111-116
Output Handling
Extracts command output from error responseThe script parses the JSON error response from the server to retrieve the output of the executed command.CVE-2025-3248.py:95-102
Review boundaries

What the analysis did not establish

  • Evidence consists solely of source code and documentation; no runtime output, network traffic, or target interaction was observed.
  • The README disclaimer states the repository is not intended to be an RCE exploit, but the code behavior matches exploitation.
  • Review is limited to the supplied text files (CVE-2025-3248.py and README.md). No binary files were present or analyzed. The script's runtime behavior was not dynamically executed or tested.
Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.

Linked vulnerabilities

1