Bug 2560446 (CVE-2026-116178)

Summary: CVE-2026-116178 vllm: vLLM: Denial of Service via inconsistent multimodal metadata
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: alinfoot, bbrownin, dtrifiro, mwoodson, weaton
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in vLLM. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by crashing the inference engine. By sending crafted requests with inconsistent or overlapping multimodal metadata to the inference endpoint, an attacker can trigger an internal processing error that terminates the engine worker and disrupts service availability.
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Description OSIDB Bzimport 2026-10-25 13:35:08 UTC 
vLLM from 0.20.0 before 0.30.0 contains a denial of service vulnerability that allows remote attackers to crash the engine by sending inconsistent multimodal metadata to the disaggregated /inference/v1/generate endpoint. Attackers can replay a valid multimodal item with repeated or overlapping mm_placeholders ranges or mismatched kwargs_data and mm_hashes lists, producing a negative text span in Qwen2.5-VL position construction that terminates the engine.