CVE-2026-93436

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductVllm

PublishedSep 17, 2026

First seenSep 17, 2026

Weakness typeCWE-401CWE-401

How to fix

Update

vllm0.30.0 or later

Patches

github.com/vllm-project/vllm/pull/55677

Affected products

Product	Affected versions	Fixed in
vllm vllm	v ≤ 0.29.0	—
vllmPyPI	v < 0.30.0	0.30.0

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