MEDIUM6.9
PYSEC-2026-4007
Quick fix
PYSEC-2026-4007 — vllm: upgrade to the fixed version with the command below.
pip install --upgrade 'vllm>=0.30.0'Details
vLLM through 0.29.0 contains a resource exhaustion vulnerability in MooncakeConnector where rejected prefill requests create ownerless transfer placeholders that are never reclaimed. Attackers can send rejected requests to exhaust sender task pools, causing valid requests to be delayed by up to 480 seconds while health checks continue returning success.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/mooncake/mooncake_connector.py#L1234-L1242[WEB]
- https://www.vulncheck.com/advisories/vllm-through-0.29.0-resource-exhaustion-via-ownerless-mooncake-transfer-placeholders[ADVISORY]
- https://github.com/vllm-project/vllm/pull/51236[FIX]
- https://github.com/vllm-project/vllm[PACKAGE]