Server-Side Request Forgery Vulnerability in vLLM by vLLM Project
CVE-2026-34753

5.4MEDIUM

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
6 April 2026

What is CVE-2026-34753?

The vLLM inference and serving engine for large language models contains a server-side request forgery (SSRF) vulnerability in the 'download_bytes_from_url' function, present in versions 0.16.0 through 0.18.0. This flaw allows an attacker with the ability to manipulate batch input JSON to issue arbitrary HTTP/HTTPS requests from the vLLM server, bypassing URL validation and domain restrictions. As a result, internal services, including cloud metadata endpoints and internal HTTP APIs, accessible from the vLLM host, are exposed to potential exploitation. The vulnerability is addressed in version 0.19.0.

Affected Version(s)

vllm >= 0.16.0, < 0.19.0

References

https://github.com/vllm-project/vllm/security/advisories/...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.