CVE-2026-42315 pyLoad: Path Traversal via Package Folder Name in set_package_data
An attacker with modify permissions can specify arbitrary directories for downloads via unsanitized folder names, potentially overwriting files or placing malicious content in sensitive locations.
- 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-2026-42315?
CVE-2026-42315 is a high-severity path traversal vulnerability in pyload, published on 11 May 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. Prior to 0.5.0b3.dev100, when passing a folder name in the set_package_data() API function call inside the data object with key "_folder", there is no sanitization at all, allowing a user with Perms.MODIFY to specify arbitrary directories as download locations for a package. This vulnerability is fixed in 0.5.0b3.dev100.
Which versions are affected by CVE-2026-42315?
3 open source packages ship an affected version, including pyload-ng. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pyload-ng PyPI | All versions | 0.5.0b3.dev100 |
pyload-ng PyPI | All versions | 0.5.0b3.dev100 |
pyload-ng PyPI | All versions | 0.5.0b3.dev100 |
Products include Pyload-Ng Project Pyload-Ng.
How do I fix CVE-2026-42315?
Upgrade pyload-ng to 0.5.0b3.dev100 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-42315 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42315 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-838g-gr43-qqg9, PYSEC-2026-129.