CVE-2026-29778 pyLoad: Arbitrary File Write via Path Traversal in edit_package()
Attackers can write arbitrary files via path traversal in pyLoad's edit_package function due to insufficient input sanitization.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-29778?
CVE-2026-29778 is a high-severity path traversal vulnerability in pyload, published on 7 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-23
Which versions are affected by CVE-2026-29778?
3 open source packages ship an affected version, including pyload-ng. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pyload-ng PyPI | From 0.5.0b3.dev13 | 0.5.0b3.dev97 |
pyload-ng PyPI | From 0.5.0b3.dev13 | 0.5.0b3.dev97 |
pyload-ng PyPI | From 0.5.0b3.dev13 | 0.5.0b3.dev97 |
Products include Pyload-Ng Project Pyload-Ng.
How do I fix CVE-2026-29778?
Upgrade pyload-ng to 0.5.0b3.dev97 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-29778 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29778 exists.
Other vulnerabilities in pyload
- CVE-2025-54802 pyLoad CNL Blueprint is vulnerable to Path Traversal through `dlc_path` leading to Remote Code Execution (RCE)
- CVE-2024-22416 Cross-Site Request Forgery on any API call in pyLoad may lead to admin privilege escalation
- CVE-2023-0488 Cross-site Scripting (XSS) - Stored in pyload/pyload
- CVE-2026-35459 pyLoad has SSRF fix bypass via HTTP redirect
- CVE-2026-35463 pyLoad has Improper Neutralization of Special Elements used in an OS Command
Sources
Also known as GHSA-6px9-j4qr-xfjw, PYSEC-2026-121.