CVE-2026-116180

High

Description

vLLM from 0.8.5 before 0.31.0 has a denial of service flaw. LogprobsTensors.empty_cpu() in vllm/v1/outputs.py allocates an uninitialized int32 tensor, and the V1 model runner leaves prompt positions reported as computed by a KV connector unwritten. A client sharing the engine can send prompt_logprobs (or echo with logprobs) against a connector-cached prefix, making tokenizer decode raise OverflowError, which crashes EngineCore and drops all co-tenant requests.

SeverityHigh

CVSS7.7

Exploit probability—

ProductVllm

PublishedOct 25, 2026

First seenOct 25, 2026

Weakness typeCWE-908CWE-908

How to fix

Update

vllm-project vllm0.31.0 or later

Vendor advisories

github.com/vllm-project/vllm/security/advisories/GHSA-rhcx-5729-88vg

Affected products

Product	Affected versions	Fixed in
vllm-project vllm	0.8.5 ≤ v < 0.31.0	0.31.0

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