CVE-2025-48943 MEDIUM

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

Vendor Vllm-Project
Product vllm
Weakness CWE-248
Published May 30, 2025
Last update May 30, 2025
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 30, 2025 CVE published
May 30, 2025 Record updated