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CVE-2025-48944— vLLM Tool Schema allows DoS via Malformed pattern and type Fields

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之前版本存在输入验证错误漏洞，该漏洞源于调用工具功能时未验证pattern和type字段的意外或畸形输入，可能导致推理工作器崩溃。

CVSS 6.5 · Medium EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-48944

Vulnerability Information
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Vulnerability Title
vLLM Tool Schema allows DoS via Malformed pattern and type Fields
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models (LLMs). In version 0.8.0 up to but excluding 0.9.0, the vLLM backend used with the /v1/chat/completions OpenAPI endpoint fails to validate unexpected or malformed input in the "pattern" and "type" fields when the tools functionality is invoked. These inputs are not validated before being compiled or parsed, causing a crash of the inference worker with a single request. The worker will remain down until it is restarted. 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
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
vLLM 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于调用工具功能时未验证pattern和type字段的意外或畸形输入，可能导致推理工作器崩溃。
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-2025-48944

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III. Intelligence Information for CVE-2025-48944

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Vendor Advisories for CVE-2025-48944 (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-2025-48942 6.5 MEDIUM vLLM DOS: Remotely kill vllm over http with invalid JSON schema
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-20

V. Comments for CVE-2025-48944

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