| Component | vLLM |
| Severity | medium (CVSS 4.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| Published (NVD) | 2026-06-20 |
| Last modified | 2026-10-12 |
| Affected versions | vllm >= 0.6.3, < 0.9.0 |
| Fixed in | 0.9.0 |
| Weakness | CWE-1333 |
| CISA KEV | not listed |
NVD 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.
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-2025-71379
- https://github.com/vllm-project/vllm/security/advisories/GHSA-j828-28rj-hfhp
- https://www.vulncheck.com/advisories/vllm-regular-expression-denial-of-service-in-multiple-components
Read more
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