CVE-2025-48943

MEDIUM

vLLM <0.9.0 - DoS

Title source: llm

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.

References (4)

[Patch] https://github.com/vllm-project/vllm/commit/08bf7840780980c7568c573c70a6a8db94fd45ff

View Patch ZIP pw:eip

[Issue Tracking] https://github.com/vllm-project/vllm/issues/17313

[Issue Tracking, Patch] https://github.com/vllm-project/vllm/pull/17623

[Vendor Advisory] https://github.com/vllm-project/vllm/security/advisories/GHSA-9hcf-v7m4-6m2j

Scores

CVSS v3 6.5

EPSS 0.0008

EPSS Percentile 24.1%

Attack Vector NETWORK

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

Classification

CWE

CWE-248

Status published

Affected Products (2)

vllm/vllm < 0.9.0

pypi/vllm < 0.9.0PyPI

Timeline

Published May 30, 2025

Tracked Since Feb 18, 2026