Medium severity4.3NVD Advisory· Published Jun 20, 2026· Updated Jun 26, 2026
CVE-2025-71379
CVE-2025-71379
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.
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Affected products
2Patches
Vulnerability mechanics
References
2- github.com/vllm-project/vllm/security/advisories/GHSA-j828-28rj-hfhpnvdExploitVendor Advisory
- www.vulncheck.com/advisories/vllm-regular-expression-denial-of-service-in-multiple-componentsnvdThird Party Advisory
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