CVE-2026-94622

High

Description

vLLM versions through 0.29.0 contain a denial of service vulnerability in the NIXL connector's metadata handling for prefill/decode disaggregated deployments. Attackers can send requests with incomplete kv_transfer_params dictionary entries to trigger an uncaught KeyError in EngineCore scheduling, causing the decode engine to terminate and making all routed requests fail until manual restart.

SeverityHigh

CVSS7.5

Exploit probability—

ProductVllm

PublishedSep 21, 2026

First seenSep 21, 2026

Weakness typeCWE-248CWE-248

How to fix

Update

vllm0.30.0 or later

Patches

github.com/vllm-project/vllm/pull/54807

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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