Vulnerability in Vllm
CVE-2026-94625
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (44.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/vllm-project/vllm (Product, product)
- github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_conne… (Product, technical-description)
- github.com/vllm-project/vllm/pull/51236 (issue-tracking, Patch, patch, Issue Tracking)
- www.vulncheck.com/advisories/vllm-through-0.29.0-resource-exhaustion-via-ownerl… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-94625?
- CVE-2026-94625 is a medium-severity vulnerability in Vllm, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 5.3/10. Published 2026-09-21.
- How severe is CVE-2026-94625?
- Medium severity. CVSS v3 base score is 5.3 out of 10.