gcdRadar
archive/Patch now/AIR-2025-0271
closedclosed 15 Apr 2025Patch now2 Disclosed vulnerabilityAI

vLLM Vulnerable to Denial of Service by Abusing XGrammar Cache

vLLM, XGrammar

vLLM was found vulnerable to denial of service attacks through the XGrammar structured output cache. Users were advised to update affected components.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

fix status
Fix status unknown
first report
15 Apr 2025
last update
15 Apr 2025

Timeline · 1

  1. 15 Apr 2025GHSA-hf3c-wxg2-49q9: vLLM vulnerable to Denial of Service by abusing xgrammar cache

Sources · 1

Advisories and databases

  1. 2025-04-15
    GHSA-hf3c-wxg2-49q9: vLLM vulnerable to Denial of Service by abusing xgrammar cache
    GitHub Advisory Database · github.com/advisories/GHSA-hf3c-wxg2-49q9

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Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
denial-of-servicexgrammar
dates
happened 15 Apr 2025 · first reported 15 Apr 2025
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 07:00Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# vLLM Vulnerable to Denial of Service by Abusing XGrammar Cache

https://gcdradar.vercel.app/incidents/vllm-vulnerable-to-denial-of-service-by-abusing-xgrammar-cac · AIR-2025-0271 · closed 2025-04-15

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2025-04-15
- AI role: Attack on AI
- Products: vLLM, XGrammar

## Summary

vLLM was found vulnerable to denial of service attacks through the XGrammar structured output cache. Users were advised to update affected components.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2025-04-15: GHSA-hf3c-wxg2-49q9: vLLM vulnerable to Denial of Service by abusing xgrammar cache (https://github.com/advisories/GHSA-hf3c-wxg2-49q9)

## Sources

- 2025-04-15 GitHub Advisory Database: GHSA-hf3c-wxg2-49q9: vLLM vulnerable to Denial of Service by abusing xgrammar cache https://github.com/advisories/GHSA-hf3c-wxg2-49q9

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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