CVE-2025-27520

Description

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.

CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

Affected Products

Vendor	Product	Versions
bentoml	bentoml	1.3.4 — 1.4.2

References

Advisories & Patches

https://github.com/bentoml/BentoML/commit/b35f4f4fcc53a8c3fe8ed9c18a013fe0a728e194

Exploits

https://github.com/bentoml/BentoML/security/advisories/GHSA-33xw-247w-6hmc https://github.com/bentoml/BentoML/security/advisories/GHSA-33xw-247w-6hmc

Frequently Asked Questions

What is CVE-2025-27520? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-27520? +

CVE-2025-27520 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-27520? +

CVE-2025-27520 affects products from bentoml, specifically: bentoml. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27520? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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