---
id: CVE-2026-100652
title: >-
  vLLM versions 0.22.0 through 0.23.0 fail to validate stop_token_ids against
  vocabulary bounds in Rust HTTP and gRPC frontends, allowing out-of-vocabulary
  token IDs to reach MinTokensLogitsProcessor
summary: >-
  vLLM versions 0.22.0 through 0.23.0 fail to validate stop_token_ids against
  vocabulary bounds in Rust HTTP and gRPC frontends, allowing out-of-vocabulary
  token IDs to reach MinTokensLogitsProcessor. Attackers can submit requests
  with min…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-20
  - CWE-1285
vendor: vllm
product: vllm
affected:
  - 'vllm >= 0.22.0, < 0.24.0'
patched:
  - vllm 0.24.0
published: '2026-09-26'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T19:22:01.530'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100652'
references:
  - url: >-
      https://github.com/vllm-project/vllm/security/advisories/GHSA-qff2-492f-9fm4
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/vllm-0.22.0-through-0.23.0-denial-of-service-via-stop-token-ids
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100652.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-100652'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541838'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-100652'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100652'
  - url: 'https://access.redhat.com/errata/RHSA-2026:84734'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - osv
  - pip
epss: 0.00419
epssPercentile: 0.3606
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T16:41:47.920735Z'
scores:
  nvd: 5.9
  vendor: 7.5
  cna: 5.9
  osv: 7.5
ingestedAt: '2026-09-26T13:33:20.918Z'
aliases:
  - PYSEC-2026-4185
  - GHSA-qff2-492f-9fm4
ecosystem: pip
---

## Overview

vLLM versions 0.22.0 through 0.23.0 fail to validate stop_token_ids against vocabulary bounds in Rust HTTP and gRPC frontends, allowing out-of-vocabulary token IDs to reach MinTokensLogitsProcessor. Attackers can submit requests with min_tokens greater than zero and out-of-vocabulary stop_token_ids to trigger CUDA tensor indexing failures that leave EngineCore in a fatal state requiring service restart.

## Affected

- `vllm >= 0.22.0, < 0.24.0`

## Remediation

Upgrade past the affected range:

- `vllm 0.24.0`

## Vendor advisories

- **Red Hat VEX** · Important · 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 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100652.json)
- **RHSA-2026:84734** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84734)

## Package advisory (CVE-2026-100652)

Affected packages:

- `vllm >= 0.22.0, < 0.24.0`

Patched in:

- `vllm 0.24.0`

Source: https://osv.dev/vulnerability/PYSEC-2026-4185