pyLoad has an Arbitrary File Write via Path Traversal in edit_package()
Date: 2026-03
Affected: pip/pyload-ng
Attack vector: path-traversal
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-29778
CWE: CWE-23
CVSS: 7.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L)

The edit_package() function implements insufficient sanitization for the pack_folder parameter. The current protection relies on a single-pass string replacement of "../", which can be bypassed using crafted recursive traversal sequences. Exploitation An authenticated user with MODIFY permission can bypass the sanitization by submitting a payload such as: `pack_folder=..././..././..././tmp` After the single-pass replacement, this becomes: `../../../tmp` Because the traversal sequences are not properly validated, the resulting normalized path escapes the intended storage directory and writes files to /tmp or other locations.


Mitigations:

Architectural layers (MAESTRO):