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CVE-2026-94626— vLLM through 0.29.0 Memory Exhaustion via Unvalidated NIXL tp_size

Quick assessment

Affected

vllm-project vllm

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 deployme

CVSS 7.5 · High EPSS 0.45% · P38 Updated Sep 23, 2026

Affected Version Matrix 1

Vendor	Product	Version Range	Status
vllm-project	vllm	`≤ 0.29.0`	affected

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Vulnerability Information

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Vulnerability Title

vLLM through 0.29.0 Memory Exhaustion via Unvalidated NIXL tp_size

Source: CVE Program / CVE List V5

Vulnerability Description

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

未经控制的内存分配

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
vllm-project	vllm	0 ~ 0.29.0	-

II. Public POCs for CVE-2026-94626

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-94626

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Patches & Fixes for CVE-2026-94626 (1)

fix(security): bound kv_transfer_params to prevent OOM via unbounded tp_size by jperezdealgaba · Pull Request #51137 · vllm-project/vllm issue-tracking patch

Other References for CVE-2026-94626 (3)

vllm/vllm/distributed/kv_transfer/kv_connector/utils.py at v0.29.0 · vllm-project/vllm · GitHub technical-description
vllm/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py at v0.29.0 · vllm-project/vllm · GitHub technical-description
vLLM through 0.29.0 Memory Exhaustion via Unvalidated NIXL tp_size | Advisories | VulnCheck third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-94626

Same Patch Batch · vllm-project · 2026-09-21 · 6 CVEs total

CVE-2026-94627	7.5 HIGH	vLLM through 0.29.0 GPU KV Cache Leak via Mooncake Transfer ID Collision
CVE-2026-94624	7.5 HIGH	vLLM through 0.29.0 Denial of Service via Unbounded P2P KV Offloading Sessions
CVE-2026-94623	7.5 HIGH	vLLM through 0.29.0 Denial of Service via NIXL Multi-Prompt Assertion Failure
CVE-2026-94622	7.5 HIGH	vLLM through 0.29.0 Denial of Service via Incomplete NIXL KV Transfer Metadata
CVE-2026-94625	5.3 MEDIUM	vLLM through 0.29.0 Resource Exhaustion via Ownerless Mooncake Transfer Placeholders

IV. Related Vulnerabilities

Same product: vllm

Same vendor: vllm-project

Same weakness: CWE-789

V. Comments for CVE-2026-94626

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-94626— vLLM through 0.29.0 Memory Exhaustion via Unvalidated NIXL tp_size

Quick assessment

Affected Version Matrix 1

I. Basic Information for CVE-2026-94626

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-94626

III. Intelligence Information for CVE-2026-94626

Patches & Fixes for CVE-2026-94626 (1)

Other References for CVE-2026-94626 (3)

Same Patch Batch · vllm-project · 2026-09-21 · 6 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-94626

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