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

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 40.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-04-04 · updated 2026-06-17
Weakness: CWE-502

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.

Affected products

BentoML: from 1.3.4 through 1.4.2

References

https://github.com/bentoml/BentoML/commit/b35f4f4fcc53a8c3fe8ed9c18a013fe0a728e194
https://github.com/bentoml/BentoML/security/advisories/GHSA-33xw-247w-6hmc
https://github.com/bentoml/BentoML/security/advisories/GHSA-33xw-247w-6hmc

Get alerted when CVE-2025-27520 or the next vulnerability affects your stack