CVE-2026-116180

HighCVSS 7.7/10Last modified Oct 28, 2026

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.

Metrics

CVSS 3.1 7.7/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Weakness enumeration

CWE-908

Affected software

Vendor	Product	Versions
vllm-project	vllm	>= 0.8.5, < 0.31.0

References

https://github.com/vllm-project/vllm/security/advisories/GHSA-rhcx-5729-88vgMitigation, Vendor Advisory
https://www.vulncheck.com/advisories/vllm-from-0.8.5-before-0.31.0-cross-tenant-dos-via-uninitialized-logprobstensorsThird Party Advisory

Timeline

Published: Oct 25, 2026
Last modified: Oct 28, 2026
NVD status: Analyzed

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