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CVE-2026-94627— vLLM through 0.29.0 GPU KV Cache Leak via Mooncake Transfer ID Collision

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 Mooncake connector through 0.29.0 fails to properly manage GPU KV cache block ownership when concurrent child requests share a single transfer ID in prefill/decode disaggregated deployments. Attackers can trigger GPU memory exhaustion by submitting comple

CVSS 7.5 · High EPSS 0.45% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
vllm-project vllm ≤ 0.29.0 affected
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I. Basic Information for CVE-2026-94627

Vulnerability Information

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Vulnerability Title
vLLM through 0.29.0 GPU KV Cache Leak via Mooncake Transfer ID Collision
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM Mooncake connector through 0.29.0 fails to properly manage GPU KV cache block ownership when concurrent child requests share a single transfer ID in prefill/decode disaggregated deployments. Attackers can trigger GPU memory exhaustion by submitting completion requests with multiple prompts, causing orphaned KV cache blocks to accumulate until process restart and eventually preventing legitimate requests from executing.
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
在移除最后引用时对内存的释放不恰当(内存泄露)
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-2026-94627

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III. Intelligence Information for CVE-2026-94627

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Patches & Fixes for CVE-2026-94627 (1)

Other References for CVE-2026-94627 (1)

Other References for CVE-2026-94627 (1)

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

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-2026-94626 7.5 HIGH vLLM through 0.29.0 Memory Exhaustion via Unvalidated NIXL tp_size
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-401

V. Comments for CVE-2026-94627

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