CVE-2025-71379
vllm - Regular Expression Denial of Service in Multiple Components
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1333 |
| Vendor | vllm |
| Product | vllm |
| Published | Jun 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
vllm / vllm
0.6.3 < 0.9.0
References
Credits
🔍 kexinoh russellb mgoin