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CVE-2026-34753— vLLM affected by Server-Side Request Forgery (SSRF) in `download_bytes_from_url `

Quick assessment

Affected
vllm-project vllm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

vLLM是vLLM开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.16.0至0.19.0之前版本存在代码问题漏洞，该漏洞源于download_bytes_from_url函数缺少URL验证，可能导致服务端请求伪造攻击。

CVSS 5.4 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-34753

Vulnerability Information
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Vulnerability Title
vLLM affected by Server-Side Request Forgery (SSRF) in `download_bytes_from_url `
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models (LLMs). From 0.16.0 to before 0.19.0, a server-side request forgery (SSRF) vulnerability in download_bytes_from_url allows any actor who can control batch input JSON to make the vLLM batch runner issue arbitrary HTTP/HTTPS requests from the server, without any URL validation or domain restrictions. This can be used to target internal services (e.g. cloud metadata endpoints or internal HTTP APIs) reachable from the vLLM host. This vulnerability is fixed in 0.19.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
vLLM 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vLLM是vLLM开源的一个适用于 LLM 的高吞吐量和内存高效推理和服务引擎。 vLLM 0.16.0至0.19.0之前版本存在代码问题漏洞，该漏洞源于download_bytes_from_url函数缺少URL验证，可能导致服务端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm >= 0.16.0, < 0.19.0 -

II. Public POCs for CVE-2026-34753

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III. Intelligence Information for CVE-2026-34753

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Vendor Advisories for CVE-2026-34753 (1)

Same Patch Batch · vllm-project · 2026-04-06 · 3 CVEs total

CVE-2026-34755 6.5 MEDIUM vLLM Affected by Denial of Service via Unbounded Frame Count in video/jpeg Base64 Processi
CVE-2026-34756 6.5 MEDIUM vLLM Affected by Unauthenticated OOM Denial of Service via Unbounded `n` Parameter in Open

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-918

V. Comments for CVE-2026-34753

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