Bug 2491059 (CVE-2025-71379)

Summary: CVE-2025-71379 vllm: vLLM: Denial of Service via regular expression denial of service (ReDoS) vulnerabilities
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: alinfoot, bbrownin, dtrifiro, jkoehler, lphiri, rbryant, weaton
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in vLLM. Multiple regular expression denial of service (ReDoS) vulnerabilities exist in versions greater than or equal to 0.6.3 and less than 0.9.0. An attacker can exploit this by submitting crafted input with nested or repeated structures to specific regex patterns within vLLM, such as those in `vllm/lora/utils.py`, the phi4mini tool parser, and the OpenAI-compatible serving chat endpoint. This can lead to severe CPU consumption and performance degradation, resulting in a denial of service (DoS) for the affected system.
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Description OSIDB Bzimport 2026-06-20 19:01:21 UTC 
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.