critical CVSS 9.8

CVE-2025-32375·Python vulnerability

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.8, there was an insecure deserialization in BentoML's runner server. By setting specific headers and parameters in the POST request, it is possible to execute any unauthorized arbitrary code on the server, which will grant the attackers to have the initial access and information disclosure on the server. This vulnerability is fixed in 1.4.8.

Severity
critical
Software
Python
Fixed in
1.4.8
Published
2025-04-09

Affected versions

From: 1.0.0

Until: 1.4.8

Fixed in: 1.4.8

How to fix this CVE

Upgrade BentoML to version 1.4.8 or later to patch the insecure deserialization vulnerability in the runner server. This vulnerability allows unauthenticated remote code execution through crafted POST requests with specific headers, so immediate patching is critical for any deployment running BentoML versions prior to 1.4.8. Verify the upgrade completes successfully and restart all BentoML services.

sudo dnf update -y python3-bentoml || sudo pip install --upgrade bentoml>=1.4.8

Defensia detects this vulnerability

What an exploitation attempt looks like

Sample log line indicative of exploitation attempts:

POST request to BentoML runner endpoints (typically :5000, :5001, or :3000) with custom deserialization headers such as 'Content-Type: application/x-python-pickle' or similar serialization protocol indicators paired with base64-encoded or binary payloads in the request body

WAF mitigation (if patching is not yet possible)

Add this rule to your WAF to block exploitation attempts while you schedule the patch. 

Block or log POST requests to BentoML runner endpoints (/v1/*, /bentoml/*) that contain serialization-related content types (application/x-python-pickle, application/x-dill, etc.) or suspicious binary content. Require authentication tokens for all runner endpoint requests and implement request payload size limits.

How to check if you are affected

  1. Check installed BentoML version: pip show bentoml | grep Version
  2. Identify exposed BentoML runner services: netstat -tulpn | grep -E 'python|bentoml' or ps aux | grep bentoml
  3. Search application logs for POST requests to BentoML runner endpoints with uncommon headers: grep -i 'POST.*runner' /var/log/bentoml/*.log
  4. Verify the fix by confirming bentoml version is 1.4.8 or higher: python -c 'import bentoml; print(bentoml.__version__)'

FAQ

What is CVE-2025-32375?

CVE-2025-32375 is an insecure deserialization flaw in BentoML's runner server that permits remote code execution without authentication. An attacker can exploit this by sending specially crafted POST requests with specific headers to execute arbitrary commands on the affected server.

Is CVE-2025-32375 being actively exploited?

No, this vulnerability is not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog and no public exploits are available. However, the critical CVSS score of 9.8 and ease of exploitation mean patching should not be delayed.

What versions of Python are affected by CVE-2025-32375?

BentoML versions 1.0.0 through 1.4.7 are vulnerable. The vulnerability is in the BentoML library itself, affecting any system running these versions regardless of the Python interpreter version installed.

How do I check if my server is vulnerable to CVE-2025-32375?

Run 'pip show bentoml' and check the Version field. If it shows any version from 1.0.0 to 1.4.7, your installation is vulnerable. You can also check with: python -c 'import bentoml; v = bentoml.__version__; print(f"Vulnerable" if v < "1.4.8" else "Patched")'

Does Defensia detect CVE-2025-32375?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If BentoML is installed on a monitored server, CVE-2025-32375 will appear in your dashboard with remediation steps.

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References

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