gcdRadar
archive/Patch now/AIR-2025-0291
closedclosed 28 May 2025Patch now2 Disclosed vulnerabilityAI

CVE-2025-48942: vLLM Denial of Service via Invalid JSON Schema

vLLM

Submitting an invalid JSON schema as a guided parameter to vLLM's completions API triggers an uncaught exception. This vulnerability allows remote attackers to crash the server.

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

CVSS
6.5
EPSS
0.01 · top 52% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
28 May 2025
last update
30 May 2025
CVE ids
CVE-2025-48942other records

Timeline · 2

  1. 28 May 2025CVE-2025-48942: vLLM DOS: Remotely kill vllm over http with invalid JSON schema
  2. 30 May 2025CVE-2025-48942: vLLM is an inference and serving engine for large language models (LLMs).

Sources · 2

Advisories and databases

  1. 2025-05-28
    CVE-2025-48942: vLLM DOS: Remotely kill vllm over http with invalid JSON schema
    GitHub Advisory Database · github.com/advisories/GHSA-6qc9-v4r8-22xg
  2. 2025-05-30
    CVE-2025-48942: vLLM is an inference and serving engine for large language models (LLMs).
    NVD · nvd.nist.gov/vuln/detail/CVE-2025-48942

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

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
vllmdos
dates
happened 28 May 2025 · first reported 28 May 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 10:04Z

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
# CVE-2025-48942: vLLM Denial of Service via Invalid JSON Schema

https://gcdradar.vercel.app/incidents/cve-2025-48942-vllm-denial-of-service-via-invalid-json-schem · AIR-2025-0291 · closed 2025-05-28

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2025-05-28
- AI role: Attack on AI
- Products: vLLM
- CVE ids: CVE-2025-48942
- CVSS: 6.5

## Summary

Submitting an invalid JSON schema as a guided parameter to vLLM's completions API triggers an uncaught exception. This vulnerability allows remote attackers to crash the server.

## What to do

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

## Latest updates

- 2025-05-30: CVE-2025-48942: vLLM is an inference and serving engine for large language models (LLMs). (https://nvd.nist.gov/vuln/detail/CVE-2025-48942)
- 2025-05-28: CVE-2025-48942: vLLM DOS: Remotely kill vllm over http with invalid JSON schema (https://github.com/advisories/GHSA-6qc9-v4r8-22xg)

## Sources

- 2025-05-28 GitHub Advisory Database: CVE-2025-48942: vLLM DOS: Remotely kill vllm over http with invalid JSON schema https://github.com/advisories/GHSA-6qc9-v4r8-22xg
- 2025-05-30 NVD: CVE-2025-48942: vLLM is an inference and serving engine for large language models (LLMs). https://nvd.nist.gov/vuln/detail/CVE-2025-48942

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

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