{"id":"CVE-2026-94627","published":"2026-09-21T22:17:01.740","lastModified":"2026-09-21T22:17:01.740","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.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-401"],"vendors":[],"products":[],"references":[{"url":"https://github.com/vllm-project/vllm","tags":[]},{"url":"https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/mooncake/mooncake_connector.py#L1978-L1989","tags":[]},{"url":"https://github.com/vllm-project/vllm/pull/49796","tags":[]},{"url":"https://www.vulncheck.com/advisories/vllm-through-0.29.0-gpu-kv-cache-leak-via-mooncake-transfer-id-collision","tags":[]}],"exploitRefs":[{"url":"https://github.com/vllm-project/vllm","tags":[]},{"url":"https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/mooncake/mooncake_connector.py#L1978-L1989","tags":[]},{"url":"https://github.com/vllm-project/vllm/pull/49796","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows attackers to trigger GPU memory exhaustion by submitting multiple completion requests, leading to orphaned KV cache blocks and preventing legitimate requests from executing.","exploitability":"Exploitation requires concurrent child requests sharing a single transfer ID in specific deployment scenarios; moderately complex setup but feasible with targeted attacks.","blast_radius":"If exploited, the impact is high as it can prevent any further legitimate requests from being processed until system restarts.","remediation":"Update to vLLM Mooncake connector version 0.29.1 or later which addresses this vulnerability.","tags":["memory-exhaustion","gpu","vllm-mooncake"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-22T06:15:27.819Z"}}