{"id":"CVE-2026-48099","aliases":["EUVD-2026-58224","GHSA-wxq4-cc2q-338q","PYSEC-2026-3428"],"status":"published","title":"WsgiDAV encoded dot segments can escape filesystem share roots","description":"WsgiDAV is a generic and extendable WebDAV server based on WSGI. WsgiDAV 4.3.3 and prior can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout. The issue is fixed with version 4.3.4.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00331,"percentile":0.26444,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2026-06-11T20:28:45Z","modified":"2026-10-28T02:30:21Z","fixes":[{"ecosystem":"PyPI","package":"wsgidav","fixed_in":["4.3.4"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"wsgidav","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"4.3.3"},{"fixed":"4.3.4"}]}]},{"source":"osv","ecosystem":"PyPI","package":"wsgidav","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.4"}]}],"versions":["0.4.0b1","0.4.0b2","0.5.0","1.0.0","1.1.0","1.2.0","1.3.0","2.0.0","2.0.1","2.1.0","2.2.1","2.2.2","2.2.3","2.2.4","2.3.0","2.4.0","2.4.1","3.0.0","3.0.0a1","3.0.0a2","3.0.0a3","3.0.0a4","3.0.0a5","3.0.0a6","3.0.0a7","3.0.1","3.0.2","3.0.3","3.0.5a2","3.0.5a3","3.1.0","3.1.1","4.0.0","4.0.0a2","4.0.1","4.0.2","4.1.0","4.2.0","4.3.0","4.3.1","4.3.2","4.3.3"]},{"source":"osv","ecosystem":"PyPI","package":"wsgidav","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.4"}]}],"versions":["0.4.0b1","0.4.0b2","0.5.0","1.0.0","1.1.0","1.2.0","1.3.0","2.0.0","2.0.1","2.1.0","2.2.1","2.2.2","2.2.3","2.2.4","2.3.0","2.4.0","2.4.1","3.0.0","3.0.0a1","3.0.0a2","3.0.0a3","3.0.0a4","3.0.0a5","3.0.0a6","3.0.0a7","3.0.1","3.0.2","3.0.3","3.0.5a2","3.0.5a3","3.1.0","3.1.1","4.0.0","4.0.0a2","4.0.1","4.0.2","4.1.0","4.2.0","4.3.0","4.3.1","4.3.2","4.3.3"]}],"products":[{"vendor":"mar10","product":"wsgidav"}],"references":[{"url":"https://github.com/mar10/wsgidav/security/advisories/GHSA-wxq4-cc2q-338q","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/mar10/wsgidav/commit/f894ed8656d7bdd7438ab8148c5a02546cb15183","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/wsgidav/PYSEC-2026-3428.yaml","tags":["x_refsource_MISC","advisory"]},{"url":"https://github.com/advisories/GHSA-wxq4-cc2q-338q","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48099.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48099","tags":["advisory"]},{"url":"https://github.com/mar10/wsgidav","tags":["package"]},{"url":"https://pypi.org/project/wsgidav","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-48099","title":"WsgiDAV encoded dot segments can escape filesystem share roots","description":"WsgiDAV is a generic and extendable WebDAV server based on WSGI. WsgiDAV 4.3.3 and prior can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout. The issue is fixed with version 4.3.4.","status":"published","published":"2026-08-13T19:15:01.942Z","modified":"2026-08-14T16:35:31.367Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:19:47.998488Z"}],"euvd":[{"id":"EUVD-2026-58224","description":"WsgiDAV is a generic and extendable WebDAV server based on WSGI. WsgiDAV 4.3.3 and prior can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout. The issue is fixed with version 4.3.4.","status":"published","published":"2026-08-13T19:15:01Z","modified":"2026-08-14T16:35:31Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T18:01:54.570698Z"}],"ghsa":[{"id":"GHSA-wxq4-cc2q-338q","title":"WsgiDAV encoded dot segments can escape filesystem share roots","description":"### Impact\nWsgiDAV 4.3.3 can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout.\n\n### Patches\nThe issue is fixed with version 4.3.4.\n\n### Preconditions\n\nThe practical impact depends on the deployment.\n\nThe deployment uses a filesystem-backed WsgiDAV share.\n\nThe attacker can send WebDAV requests accepted by that share. This may be an anonymous share or an authenticated WebDAV user. This is not an authentication bypass.\n\n### Details\n\nThe issue is in `FilesystemProvider._loc_to_file_path()`. The method builds a candidate path with `os.path.abspath(os.path.join(root_path, *path_parts))`, then checks containment with `file_path.startswith(root_path)`. This is not path-boundary aware. For example, if the configured share root is `/tmp/share`, a resolved sibling path such as `/tmp/share_evil/secret.txt` still starts with the string `/tmp/share`.\n\nIn a local proof, this allowed GET, PUT, and DELETE requests to operate on files outside the configured share root.\n\nThe WSGI/server layer forwards the encoded dot segment to WsgiDAV's PATH_INFO. The local proof used `/%2e%2e/...`, which wsgiref passed through as `/../...`.\n\nA sibling or neighboring path exists whose absolute path starts with the configured root path string, such as `/tmp/share` and `/tmp/share_evil`.\n\nThe WsgiDAV process has OS permissions for the outside path.","status":"published","published":"2026-06-11T20:28:45Z","modified":"2026-06-11T20:28:47Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:40:26.12116Z"}],"nvd":[{"id":"CVE-2026-48099","description":"WsgiDAV is a generic and extendable WebDAV server based on WSGI. WsgiDAV 4.3.3 and prior can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout. The issue is fixed with version 4.3.4.","status":"published","published":"2026-08-13T20:17:22.313Z","modified":"2026-09-09T21:02:22.66Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","level":"high","assessor":"secondary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:37.557758Z"}],"osv":[{"id":"CVE-2026-48099","title":"WsgiDAV encoded dot segments can escape filesystem share roots","description":"WsgiDAV is a generic and extendable WebDAV server based on WSGI. WsgiDAV 4.3.3 and prior can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout. The issue is fixed with version 4.3.4.","status":"published","published":"2026-08-13T19:15:01.942Z","modified":"2026-10-28T02:30:21.386389364Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:06.701612Z"},{"id":"GHSA-wxq4-cc2q-338q","title":"WsgiDAV encoded dot segments can escape filesystem share roots","description":"### Impact\nWsgiDAV 4.3.3 can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout.\n\n### Patches\nThe issue is fixed with version 4.3.4.\n\n### Preconditions\n\nThe practical impact depends on the deployment.\n\nThe deployment uses a filesystem-backed WsgiDAV share.\n\nThe attacker can send WebDAV requests accepted by that share. This may be an anonymous share or an authenticated WebDAV user. This is not an authentication bypass.\n\n### Details\n\nThe issue is in `FilesystemProvider._loc_to_file_path()`. The method builds a candidate path with `os.path.abspath(os.path.join(root_path, *path_parts))`, then checks containment with `file_path.startswith(root_path)`. This is not path-boundary aware. For example, if the configured share root is `/tmp/share`, a resolved sibling path such as `/tmp/share_evil/secret.txt` still starts with the string `/tmp/share`.\n\nIn a local proof, this allowed GET, PUT, and DELETE requests to operate on files outside the configured share root.\n\nThe WSGI/server layer forwards the encoded dot segment to WsgiDAV's PATH_INFO. The local proof used `/%2e%2e/...`, which wsgiref passed through as `/../...`.\n\nA sibling or neighboring path exists whose absolute path starts with the configured root path string, such as `/tmp/share` and `/tmp/share_evil`.\n\nThe WsgiDAV process has OS permissions for the outside path.","status":"published","published":"2026-06-11T20:28:45Z","modified":"2026-07-13T16:43:31.113498793Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:59.131095Z"},{"id":"PYSEC-2026-3428","title":"WsgiDAV encoded dot segments can escape filesystem share roots","description":"### Impact\nWsgiDAV 4.3.3 can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout.\n\n### Patches\nThe issue is fixed with version 4.3.4.\n\n### Preconditions\n\nThe practical impact depends on the deployment.\n\nThe deployment uses a filesystem-backed WsgiDAV share.\n\nThe attacker can send WebDAV requests accepted by that share. This may be an anonymous share or an authenticated WebDAV user. This is not an authentication bypass.\n\n### Details\n\nThe issue is in `FilesystemProvider._loc_to_file_path()`. The method builds a candidate path with `os.path.abspath(os.path.join(root_path, *path_parts))`, then checks containment with `file_path.startswith(root_path)`. This is not path-boundary aware. For example, if the configured share root is `/tmp/share`, a resolved sibling path such as `/tmp/share_evil/secret.txt` still starts with the string `/tmp/share`.\n\nIn a local proof, this allowed GET, PUT, and DELETE requests to operate on files outside the configured share root.\n\nThe WSGI/server layer forwards the encoded dot segment to WsgiDAV's PATH_INFO. The local proof used `/%2e%2e/...`, which wsgiref passed through as `/../...`.\n\nA sibling or neighboring path exists whose absolute path starts with the configured root path string, such as `/tmp/share` and `/tmp/share_evil`.\n\nThe WsgiDAV process has OS permissions for the outside path.","status":"published","published":"2026-07-13T15:46:16.868348Z","modified":"2026-07-13T16:33:27.849732925Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:52:56.847083Z"}]}}