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EUVD-2026-275008

fkie_cve-2026-29778

pyLoad is a free and open-source download manager written in Python. From version 0.5.0b3.dev13 to 0.5.0b3.dev96, 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. This issue has been patched in version 0.5.0b3.dev97.

GHSA-6px9-j4qr-xfjw — pyLoad has an Arbitrary File Write via Path Traversal in edit_package()

Affected: PyPI: pyload-ng

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.

PYSEC-2026-121

Affected: PyPI: pyload-ng