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How the CVE Works
The CVE-2025-54381 vulnerability in BentoML (v1.4.0 to 1.4.19) allows unauthenticated attackers to exploit SSRF via file upload handlers. The multipart form and JSON processors fetch files from user-supplied URLs without validation, enabling requests to internal networks, cloud metadata APIs, or restricted systems. Attackers can bypass security controls by crafting malicious URLs, leading to data leaks, internal service abuse, or further exploitation. The flaw exists due to insufficient input sanitization in the `file_upload` module, where external resource fetching is enabled by default.
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Platform: BentoML
Version: 1.4.0-1.4.19
Vulnerability: SSRF
Severity: Critical
Date: 08/05/2025
Prediction: Patch expected by 08/20/2025
What Undercode Say
curl -X POST -F "url=http://internal-api" http://bentoml-server/upload
import bentoml bentoml.configure(block_internal_ips=True) Mitigation snippet
How Exploit
- Craft malicious URL pointing to `169.254.169.254` (cloud metadata).
- Upload via `/upload` endpoint with poisoned JSON.
- Exfiltrate internal API responses.
Protection from this CVE
- Upgrade to BentoML ≥1.4.19.
- Disable remote URL uploads.
- Implement network ACLs.
Impact
- Unauthorized internal network access.
- Cloud metadata exposure.
- Remote code execution (chained).
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Sources:
Reported By: nvd.nist.gov
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