Vulnerability Details CVE-2025-71379
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 23.9%
CVSS Severity
CVSS v3 Score 4.3
Products affected by CVE-2025-71379
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cpe:2.3:a:vllm:vllm:0.6.3
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cpe:2.3:a:vllm:vllm:0.6.4
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cpe:2.3:a:vllm:vllm:0.6.5
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cpe:2.3:a:vllm:vllm:0.6.6
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cpe:2.3:a:vllm:vllm:0.7.0
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cpe:2.3:a:vllm:vllm:0.7.1
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cpe:2.3:a:vllm:vllm:0.7.2
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cpe:2.3:a:vllm:vllm:0.7.3
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cpe:2.3:a:vllm:vllm:0.8.0
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cpe:2.3:a:vllm:vllm:0.8.1
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cpe:2.3:a:vllm:vllm:0.8.2
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cpe:2.3:a:vllm:vllm:0.8.3
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cpe:2.3:a:vllm:vllm:0.8.4
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cpe:2.3:a:vllm:vllm:0.8.5