---
id: CVE-2026-116178
aliases:
  - PYSEC-2026-4353
  - GHSA-34qw-q2h2-jp3m
title: >-
  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 inc…
summary: >-
  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
  re…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: vllm
product: vllm
ecosystem: pip
affected:
  - 'vllm >= 0.20.0, < 0.30.0'
patched:
  - vllm 0.30.0
published: '2026-10-25'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T11:00:02.784018523Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/PYSEC-2026-4353'
references:
  - url: >-
      https://www.vulncheck.com/advisories/vllm-0.20.0-before-0.30.0-dos-via-inference-v1-generate-mm-placeholders
  - url: >-
      https://github.com/vllm-project/vllm/security/advisories/GHSA-34qw-q2h2-jp3m
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-116178.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-116178'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2560446'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-116178'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-116178'
tags:
  - osv
  - pip
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00331
epssPercentile: 0.26228
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-26T19:38:11.562668Z'
cwe:
  - CWE-20
  - CWE-1288
scores:
  osv: 7.5
  cna: 5.9
ingestedAt: '2026-10-25T22:08:29.946Z'
---

## Overview

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.

## Affected packages

- `vllm >= 0.20.0, < 0.30.0`

## Remediation

Upgrade to a patched release:

- `vllm 0.30.0`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · updated 2026-10-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-116178.json)