CVE-2026-94626

vLLM through 0.29.0 fails to validate the tp_size parameter in kv_transfer_params on OpenAI-compatible completion endpoints, allowing attackers to allocate unbounded memory. Attackers can supply arbitrary tp_size values in prefill/decode disaggregated deployments to exhaust memory and trigger kernel OOM-kill of the decode worker process.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

V3 Legend

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/utils.py#L569-L573	Product
https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L277	Product
https://github.com/vllm-project/vllm/pull/51137	Issue Tracking Patch
https://www.vulncheck.com/advisories/vllm-through-0.29.0-memory-exhaustion-via-unvalidated-nixl-tp-size	Third Party Advisory

Configurations

Configuration 1 (hide)

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

History

29 Sep 2026, 12:46

Type	Values Removed	Values Added
CPE		cpe:2.3:a:vllm:vllm::::::::
First Time		Vllm 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/utils.py#L569-L573 -~~	() https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/utils.py#L569-L573 - Product
References	~~() https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L277 -~~	() https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L277 - Product
References	~~() https://github.com/vllm-project/vllm/pull/51137 -~~	() https://github.com/vllm-project/vllm/pull/51137 - Issue Tracking, Patch
References	~~() https://www.vulncheck.com/advisories/vllm-through-0.29.0-memory-exhaustion-via-unvalidated-nixl-tp-size -~~	() https://www.vulncheck.com/advisories/vllm-through-0.29.0-memory-exhaustion-via-unvalidated-nixl-tp-size - Third Party Advisory

21 Sep 2026, 22:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-21 22:17

Updated : 2026-09-29 12:46

NVD link : CVE-2026-94626

Mitre link : CVE-2026-94626

CVE.ORG link : CVE-2026-94626

JSON object : View

Products Affected

vllm

vllm

CWE

CWE-789

Memory Allocation with Excessive Size Value

7.5 /10