CVE-2026-94622

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/vllm-project/vllm	Product
https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L294-L312	Product
https://github.com/vllm-project/vllm/pull/54807	Issue Tracking Patch
https://www.vulncheck.com/advisories/vllm-through-0.29.0-denial-of-service-via-incomplete-nixl-kv-transfer-metadata	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*

History

29 Sep 2026, 12:47

Type	Values Removed	Values Added
CPE		cpe:2.3:a:vllm:vllm::::::::
References	~~() https://github.com/vllm-project/vllm -~~	() https://github.com/vllm-project/vllm - Product
References	~~() https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L294-L312 -~~	() https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L294-L312 - Product
References	~~() https://github.com/vllm-project/vllm/pull/54807 -~~	() https://github.com/vllm-project/vllm/pull/54807 - Issue Tracking, Patch
References	~~() https://www.vulncheck.com/advisories/vllm-through-0.29.0-denial-of-service-via-incomplete-nixl-kv-transfer-metadata -~~	() https://www.vulncheck.com/advisories/vllm-through-0.29.0-denial-of-service-via-incomplete-nixl-kv-transfer-metadata - Third Party Advisory
First Time		Vllm vllm Vllm

21 Sep 2026, 22:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-21 22:17

Updated : 2026-09-29 12:47

NVD link : CVE-2026-94622

Mitre link : CVE-2026-94622

CVE.ORG link : CVE-2026-94622

JSON object : View

Products Affected

vllm

vllm

CWE

CWE-248

Uncaught Exception

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