---
id: CVE-2026-116173
aliases:
  - PYSEC-2026-4350
  - GHSA-6pgw-f3pv-4h8q
title: >-
  vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that
  allows remote attackers to terminate EngineCore by bypassi…
summary: >-
  vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that
  allows remote attackers to terminate EngineCore by bypassing logprob_token_ids
  limits in the Rust gRPC frontend. Attackers can send Generate or
  GenerateStream…
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 >= 0.22.0, < 0.24.0'
patched:
  - vllm 0.24.0
published: '2026-10-25'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T11:00:02.789228032Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/PYSEC-2026-4350'
references:
  - url: >-
      https://github.com/vllm-project/vllm/security/advisories/GHSA-6pgw-f3pv-4h8q
  - url: >-
      https://www.vulncheck.com/advisories/vllm-0.22.0-before-0.24.0-denial-of-service-via-grpc-output-candidates-token-ids
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-116173.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-116173'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2560420'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-116173'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-116173'
tags:
  - osv
  - pip
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00339
epssPercentile: 0.27306
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-26T19:39:11.858594Z'
cwe:
  - CWE-20
  - CWE-248
scores:
  osv: 7.5
  cna: 5.9
ingestedAt: '2026-10-25T22:08:29.947Z'
---

## Overview

vLLM from 0.22.0 before 0.24.0 contains a denial of service vulnerability that allows remote attackers to terminate EngineCore by bypassing logprob_token_ids limits in the Rust gRPC frontend. Attackers can send Generate or GenerateStream requests with output_logprobs enabled and more than 128 output_candidates.token_ids, triggering a fatal sampler exception that crashes the engine.

## Affected packages

- `vllm >= 0.22.0, < 0.24.0`

## Remediation

Upgrade to a patched release:

- `vllm 0.24.0`

## 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-2026-116173.json)