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CVE-2025-48943— vLLM allows clients to crash the openai server with invalid regex

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，该漏洞源于使用结构化输出时提供无效正则表达式可能导致拒绝服务。

CVSS 6.5 · Medium EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-48943

Vulnerability Information
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Vulnerability Title
vLLM allows clients to crash the openai server with invalid regex
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models (LLMs). Version 0.8.0 up to but excluding 0.9.0 have a Denial of Service (ReDoS) that causes the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to GHSA-6qc9-v4r8-22xg/CVE-2025-48942, 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，该漏洞源于使用结构化输出时提供无效正则表达式可能导致拒绝服务。
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 >= 0.8.0, < 0.9.0 -

II. Public POCs for CVE-2025-48943

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III. Intelligence Information for CVE-2025-48943

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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-2025-48942 6.5 MEDIUM vLLM DOS: Remotely kill vllm over http with invalid JSON schema

IV. Related Vulnerabilities

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

V. Comments for CVE-2025-48943

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