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 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.
Vulnerability class: Insecure Deserialization
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.406 (98.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.393 · newest: 0.406 · change: +0.014
Affected products
- Bentoml — versions >= 1.3.4, < 1.4.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/bentoml/BentoML/security/advisories/GHSA-33xw-247w-6hmc (Exploit, Third Party Advisory)
- github.com/bentoml/BentoML/commit/b35f4f4fcc53a8c3fe8ed9c18a013fe0a728e194 (Patch)
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?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.