{"id":"CVE-2026-94626","published":"2026-09-21T22:17:01.587","lastModified":"2026-09-21T22:17:01.587","description":"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.","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-789"],"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/utils.py#L569-L573","tags":[]},{"url":"https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L277","tags":[]},{"url":"https://github.com/vllm-project/vllm/pull/51137","tags":[]},{"url":"https://www.vulncheck.com/advisories/vllm-through-0.29.0-memory-exhaustion-via-unvalidated-nixl-tp-size","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/utils.py#L569-L573","tags":[]},{"url":"https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L277","tags":[]},{"url":"https://github.com/vllm-project/vllm/pull/51137","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows attackers to allocate unbounded memory by supplying arbitrary tp_size values, potentially leading to a denial of service via kernel OOM-kill.","exploitability":"Exploitation is relatively straightforward with preconditions including access to prefill/decode disaggregated deployments.","blast_radius":"If exploited, this could result in significant impact, such as service disruption for affected systems.","remediation":"Update to a patched version of vLLM greater than 0.29.0 or apply vendor-provided patches immediately.","tags":["memory-exhaustion","dos","patch-available"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-22T06:15:16.898Z"}}