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CVE-2026-9540— vllm-project vllm OpenAI-compatible Serving Path denial of service

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 0.19.0版本存在安全漏洞，该漏洞源于OpenAI-compatible Serving Path组件中未知处理操作不当，可能导致拒绝服务。

CVSS 5.3 · Medium EPSS 0.72% · P53

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
vllm-project vllm 0.19.0 affected
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I. Basic Information for CVE-2026-9540

Vulnerability Information
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Vulnerability Title
vllm-project vllm OpenAI-compatible Serving Path denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in vllm-project vllm 0.19.0. This issue affects some unknown processing of the component OpenAI-compatible Serving Path. Such manipulation leads to denial of service. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The pull request to fix this issue awaits acceptance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
vLLM 安全漏洞
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 0.19.0版本存在安全漏洞，该漏洞源于OpenAI-compatible Serving Path组件中未知处理操作不当，可能导致拒绝服务。
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 0.19.0 cpe:2.3:a:vllm-project:vllm:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9540

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-9540

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Patches & Fixes for CVE-2026-9540 (1)

Vendor Pages for CVE-2026-9540 (1)

Other References for CVE-2026-9540 (1)

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-404

V. Comments for CVE-2026-9540

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