Bug 2538868 (CVE-2026-94625)

Summary: CVE-2026-94625 vllm: vLLM: Resource exhaustion via rejected prefill requests
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: alinfoot, bbrownin, dtrifiro, weaton
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in vLLM. A remote attacker can exploit this vulnerability by sending rejected prefill requests to the MooncakeConnector. This action creates ownerless transfer placeholders that are not properly reclaimed, leading to resource exhaustion. Consequently, legitimate requests may experience significant delays, up to 480 seconds, even though system health checks continue to report normal operation.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-09-22 20:59:31 UTC
vLLM through 0.29.0 contains a resource exhaustion vulnerability in MooncakeConnector where rejected prefill requests create ownerless transfer placeholders that are never reclaimed. Attackers can send rejected requests to exhaust sender task pools, causing valid requests to be delayed by up to 480 seconds while health checks continue returning success.