| Component | vLLM |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2025-05-30 |
| Last modified | 2026-06-17 |
| Affected versions | vllm >= 0.8.0, < 0.9.0 |
| Fixed in | 0.9.0 |
| Weakness | CWE-20 |
| CISA KEV | not listed |
NVD description
vLLM is an inference and serving engine for large language models (LLMs). In version 0.8.0 up to but excluding 0.9.0, the vLLM backend used with the /v1/chat/completions OpenAPI endpoint fails to validate unexpected or malformed input in the "pattern" and "type" fields when the tools functionality is invoked. These inputs are not validated before being compiled or parsed, causing a crash of the inference worker with a single request. The worker will remain down until it is restarted. Version 0.9.0 fixes the issue.
What to do
- Upgrade vLLM to
0.9.0or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2025-48944
- https://github.com/vllm-project/vllm/pull/17623
- https://github.com/vllm-project/vllm/security/advisories/GHSA-vrq3-r879-7m65
Read more
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