CVE-2026-116178

Medium

Description

vLLM from 0.20.0 before 0.30.0 contains a denial of service vulnerability that allows remote attackers to crash the engine by sending inconsistent multimodal metadata to the disaggregated /inference/v1/generate endpoint. Attackers can replay a valid multimodal item with repeated or overlapping mm_placeholders ranges or mismatched kwargs_data and mm_hashes lists, producing a negative text span in Qwen2.5-VL position construction that terminates the engine.

SeverityMedium

CVSS5.9

Exploit probability—

ProductVllm

PublishedOct 25, 2026

First seenOct 25, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

vllm-project vllm0.30.0 or later

Vendor advisories

github.com/vllm-project/vllm/security/advisories/GHSA-34qw-q2h2-jp3m

Affected products

Product	Affected versions	Fixed in
vllm-project vllm	0.20.0 ≤ v < 0.30.0	0.30.0

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