# CVE-2026-35592: pyload-ng path traversal in UnTar extraction

Source: https://junglewise.ai/threats/cve-2026-35592-pyload-ng-path-traversal-in-untar-extraction  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-08. Updated: 2026-06-08  
License: CC BY 4.0 with a link back

CVE-2026-35592 · Severity: medium · CVSS 5.3 · Published 2026-04-08

pyload-ng is a download manager that automates file downloads. A vulnerability in its archive extraction component allows a malicious download to write files outside of the intended folder. This could allow an attacker to overwrite system files, plant malicious scripts, or disrupt operations if a user downloads a specially crafted archive.

Technologies: [pyload-ng (PyPI)](https://junglewise.ai/threats/technologies/pyload-ng). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-35592 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-35592 being exploited in the wild.

**How severe is CVE-2026-35592?** Medium severity, with a CVSS score of 5.3, published 8 April 2026.

**Which products and versions are affected?** pyload-ng (PyPI) < 0.5.0b3.dev97, ECOSYSTEM:introduced=0,fixed=0.5.0b3.dev97.

**Is there a fix for CVE-2026-35592?** Yes. pyload-ng (PyPI): upgrade to 0.5.0b3.dev97 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-35592 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-35592?** Check whether you run pyload-ng (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- pyload-ng (PyPI): upgrade to 0.5.0b3.dev97 or later

  ```sh
  pip install "pyload-ng>=0.5.0b3.dev97"
  ```


## Technical details

The `_safe_extractall` function in `src/pyload/plugins/extractors/UnTar.py` implements a path traversal check using `os.path.commonprefix()`. Because this function performs character-level string comparison rather than path-component comparison, it can be bypassed using sibling directory names that share a common string prefix (e.g., `/downloads/pkg` vs `/downloads/pkg_evil`). An attacker can craft a Tar archive with members containing `..` sequences that resolve to locations outside the extraction directory. Exploitation requires the 'ExtractArchive' addon to be enabled and the victim to download a malicious archive. The vulnerability is addressed in version 0.5.0b3.dev97 by using `os.path.commonpath()`.

## Affected products

- pyload pyload-ng < 0.5.0b3.dev97

## Identifiers

- CVE-2026-35592
- GHSA-mvwx-582f-56r7
- PYSEC-2026-124

## Timeline

- 2026-04-07: advisory: NVD publication date
- 2026-04-08: disclosed: GitHub Advisory published

## References

- [https://api.github.com/users/offset](https://api.github.com/users/offset)
- [https://github.com/offset](https://github.com/offset)
- [https://api.github.com/users/offset/gists%7B/gist_id%7D](https://api.github.com/users/offset/gists%7B/gist_id%7D)
- [https://api.github.com/users/offset/repos](https://api.github.com/users/offset/repos)
- [https://avatars.githubusercontent.com/u/114768995?v=4](https://avatars.githubusercontent.com/u/114768995?v=4)
- [https://api.github.com/users/offset/events%7B/privacy%7D](https://api.github.com/users/offset/events%7B/privacy%7D)

## Related threats

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- [pyLoad rate-limit bypass and audit-log spoofing via X-Forwarded-For header](https://junglewise.ai/threats/pyload-rate-limit-bypass-and-audit-log-spoofing-via-trusted-client-0df0fd12)
- [pyLoad session invalidation bypass in privilege revocation and password change](https://junglewise.ai/threats/pyload-privilege-revocation-and-password-change-through-the-rest-api-do-8e7301ba)