What is CVE-2025-27520?

CVE-2025-27520 is a critical-severity vulnerability in Bentoml, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-04-04.

How severe is CVE-2025-27520?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-27520 known to be exploited?

6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Bentoml

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…

Vulnerability class: Insecure Deserialization

EPSS: 0.758 (98.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Bentoml — versions >= 1.3.4, < 1.4.3

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

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

Frequently asked questions

What is CVE-2025-27520?: CVE-2025-27520 is a critical-severity vulnerability in Bentoml, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-04-04.
How severe is CVE-2025-27520?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-27520 known to be exploited?: 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.