pyLoad up to 0.5.0b3.dev92 UnTar.py _safe_extractall path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in pyLoad. This affects the function _safe_extractall of the file src/pyload/plugins/extractors/UnTar.py. This manipulation causes path traversal. This vulnerability is registered as CVE-2026-35592. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in pyLoad. Affected by this vulnerability is the function _safe_extractall of the file src/pyload/plugins/extractors/UnTar.py. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev97, the _safe_extractall() function in src/pyload/plugins/extractors/UnTar.py uses os.path.commonprefix() for its path traversal check, which performs character-level string comparison rather than path-level comparison. This allows a specially crafted tar archive to write files outside the intended extraction directory. The correct function os.path.commonpath() was added to the codebase in the CVE-2026-32808 fix (commit 5f4f0fa) but was never applied to _safe_extractall(), making this an incomplete fix. This vulnerability is fixed in 0.5.0b3.dev97.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-35592 since 04/03/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 0.5.0b3.dev97 eliminates this vulnerability.

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Productinfo

Name

• pyLoad

Version

• 0.5.0b3.dev31
• 0.5.0b3.dev32
• 0.5.0b3.dev33
• 0.5.0b3.dev36
• 0.5.0b3.dev40
• 0.5.0b3.dev41
• 0.5.0b3.dev42
• 0.5.0b3.dev44
• 0.5.0b3.dev75
• 0.5.0b3.dev77
• 0.5.0b3.dev78
• 0.5.0b3.dev79
• 0.5.0b3.dev87
• 0.5.0b3.dev88
• 0.5.0b3.dev89
• 0.5.0b3.dev90
• 0.5.0b3.dev91
• 0.5.0b3.dev92

Website

• Product: https://github.com/pyload/pyload/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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