CVE-2025-32375 — Insecure Deserialization leads to RCE in BentoML's runner server

Affected: BentoML

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.8, there was an insecure deserialization in BentoML's runner server. By setting specific headers and parameters in the POST request, it is possible to execute any unauthorized arbitrary code on the server, which will grant the attackers to have the initial access and information disclosure on the server. This vulnerability is fixed in 1.4.8.

GHSA-7v4r-c989-xh26 — BentoML's runner server Vulnerable to Remote Code Execution (RCE) via Insecure Deserialization

Affected: PyPI: bentoml

### Summary There was an insecure deserialization in BentoML's runner server. By setting specific headers and parameters in the POST request, it is possible to execute any unauthorized arbitrary code on the server, which will grant the attackers to have the initial access and information disclosure on the server.

### PoC - First, create a file named **model.py** to create a simple model and save it ``` import bentoml import numpy as np

class mymodel: def predict(self, info): return np.abs(info) def __call__(self, info): return self.predict(info)

model = mymodel() bentoml.picklable_model.save_model("mymodel", model) ``` - Then run the following command to save this model ``` python3 model.py ``` - Next, create **bentofile.yaml** to build this model ``` service: "service.py" description: "A model serving service with BentoML" python: packages: - bentoml - numpy models: - tag: MyModel:latest include: - "*.py" ``` - Then, create **service.py** to host this model ``` import bentoml from bentoml.io import NumpyNdarray import numpy as np

model_runner = bentoml.picklable_model.get("mymodel:latest").to_runner()

svc = bentoml.Service("myservice", runners=[model_runner])

async def predict(input_data: np.ndarray):

input_columns = np.split(input_data, input_data.shape[1], axis=1) result_generator = model_runner.async_run(input_columns, is_stream=True) async for result in result_generator: yield result ``` - Then,…

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CVE-2025-32375 — Insecure Deserialization leads to RCE in BentoML's runner server

GHSA-7v4r-c989-xh26 — BentoML's runner server Vulnerable to Remote Code Execution (RCE) via Insecure Deserialization