AI agent vulnerability · vLLM

GHSA-vfm7-4h43-gp6m: Duplicate Advisory: vLLM Vulnerable to Regular Expression Denial of Service

mediumCVSS 4.0 5.3 · 3.1 4.3

This advisory was withdrawn on Sep 11, 2026. The publisher no longer considers it a valid vulnerability.

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-j828-28rj-hfhp. This link is maintained to preserve external references. Original Description vLLM versions = 0.6.3 and < 0.9.0 contain multiple regular expression denial of service (ReDoS) vulnerabilities.

Published Jun 20, 2026 · Updated Sep 11, 2026

Affected packages

vllm

Ecosystem: PyPI
Affected: >= 0.6.3, < 0.9.0
Fixed in: 0.9.0
Check: pip show vllm

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-j828-28rj-hfhp. This link is maintained to preserve external references.

Original 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.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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