CVE-2025-27520 — BentoML Allows Remote Code Execution (RCE) via Insecure Deserialization

Affected: BentoML

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. A Remote Code Execution (RCE) vulnerability caused by insecure deserialization has been identified in the latest version (v1.4.2) of BentoML. It allows any unauthenticated user to execute arbitrary code on the server. It exists an unsafe code segment in serde.py. This vulnerability is fixed in 1.4.3.

GHSA-33xw-247w-6hmc — BentoML Allows Remote Code Execution (RCE) via Insecure Deserialization

Affected: PyPI: bentoml

### Summary A Remote Code Execution (RCE) vulnerability caused by insecure deserialization has been identified in the latest version(v1.4.2) of BentoML. It allows any unauthenticated user to execute arbitrary code on the server.

### Details It exists an unsafe code segment in `serde.py`: ```Python def deserialize_value(self, payload: Payload) -> t.Any: if "buffer-lengths" not in payload.metadata: return pickle.loads(b"".join(payload.data)) ``` Through data flow analysis, it is confirmed that the `payload `content is sourced from an HTTP request, which can be fully manipulated by the attack. Due to the lack of validation in the code, maliciously crafted serialized data can execute harmful actions during deserialization.

### PoC Environment:

- Server host: - IP: 10.98.36.123 - OS: Ubuntu - Attack host: - IP: 10.98.36.121 - OS: Ubuntu

1. Follow the instructions on the BentoML official README(https://github.com/bentoml/BentoML) to set up the environment.

1.1 Install BentoML (Server host: 10.98.36.123) : ` pip install -U bentoml`

1.2 Define APIs in a `service.py` file (Server host: 10.98.36.123) : ``` Python from __future__ import annotations

import bentoml

@bentoml.service( resources={"cpu": "4"} ) class Summarization: def __init__(self) -> None: import torch from transformers import pipeline

device = "cuda" if torch.cuda.is_available() else "cpu" self.pipeline = pipeline('summarization', device=device)…

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CVE-2025-27520 — BentoML Allows Remote Code Execution (RCE) via Insecure Deserialization

GHSA-33xw-247w-6hmc — BentoML Allows Remote Code Execution (RCE) via Insecure Deserialization