CVE-2025-71379
vllm - Regular Expression Denial of Service in Multiple Components
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jun 20, 2026
- Updated
- Jun 22, 2026
- Reserved
- Jun 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-1333 Inefficient Regular Expression Complexity
Affected Products
| Product | Versions |
|---|---|
vllmvllm |
|
References
- GHSA Advisory GHSA-j828-28rj-hfhpvendor-advisory
- VulnCheck Advisory: vllm - Regular Expression Denial of Service in Multiple Componentsthird-party-advisory
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