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CVE-2025-48942— vLLM DOS: Remotely kill vllm over http with invalid JSON schema

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 0.8.0至0.9.0之前版本存在安全漏洞，该漏洞源于使用无效json_schema调用/v1/completions API可能导致服务器崩溃。

CVSS 6.5 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-48942

Vulnerability Information
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Vulnerability Title
vLLM DOS: Remotely kill vllm over http with invalid JSON schema
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models (LLMs). In versions 0.8.0 up to but excluding 0.9.0, hitting the /v1/completions API with a invalid json_schema as a Guided Param kills the vllm server. This vulnerability is similar GHSA-9hcf-v7m4-6m2j/CVE-2025-48943, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
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 0.8.0至0.9.0之前版本存在安全漏洞，该漏洞源于使用无效json_schema调用/v1/completions API可能导致服务器崩溃。
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 >= 0.8.0, < 0.9.0 -

II. Public POCs for CVE-2025-48942

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III. Intelligence Information for CVE-2025-48942

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Vendor Advisories for CVE-2025-48942 (1)

Same Patch Batch · vllm-project · 2025-05-30 · 4 CVEs total

CVE-2025-48887 6.5 MEDIUM vLLM has a Regular Expression Denial of Service (ReDoS, Exponential Complexity) Vulnerabil
CVE-2025-48944 6.5 MEDIUM vLLM Tool Schema allows DoS via Malformed pattern and type Fields
CVE-2025-48943 6.5 MEDIUM vLLM allows clients to crash the openai server with invalid regex

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-248

V. Comments for CVE-2025-48942

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