CVE-2025-71379

Medium

Description

vLLM versions >= 0.6.3 and < 0.9.0 contain multiple regular expression denial of service (ReDoS) vulnerabilities. Several regex patterns — in vllm/lora/utils.py, the phi4mini tool parser, and the OpenAI-compatible serving chat endpoint — are susceptible to catastrophic backtracking. An attacker submitting crafted input with nested or repeated structures can trigger severe CPU consumption and performance degradation, resulting in denial of service.

SeverityMedium

CVSS4.3

Exploit probability—

ProductVllm

PublishedJun 20, 2026

First seenJun 20, 2026

Weakness typeCWE-1333CWE-1333

How to fix

Update

vllm vllm0.9.0 or later
vllm0.9.0 or later

Vendor advisories

github.com/vllm-project/vllm/security/advisories/GHSA-j828-28rj-hfhp

Affected products

Product	Affected versions	Fixed in
vllm vllm	0.6.3 ≤ v < 0.9.0	0.9.0
vllmPyPI	0.6.3 ≤ v < 0.9.0	0.9.0

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