Bug 2538717 (CVE-2026-93436)

Summary: CVE-2026-93436 vllm: vLLM: Denial of Service via memory exhaustion from rejected 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 submitting specially crafted inference requests that are rejected but still cause the system to retain decode-side metadata. This improper cleanup leads to an unbounded exhaustion of decode-worker memory, resulting in a denial of service (DoS) condition where the worker repeatedly restarts.
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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 20:09:26 UTC
vLLM through 0.29.0 fails to properly clean up decode-side metadata for rejected inference requests in prefill/decode disaggregated deployments. Remote attackers can submit requests with max_tokens=0 to exhaust decode-worker memory without bound until the worker restarts.