CVE-2026-29778: pyLoad has an Arbitrary File Write via Path Traversal in edit_package()

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.