brightio penelope up to 0.19.x Download penelope.py tar.extractall path traversal

Summaryinfo

A vulnerability was found in brightio penelope up to 0.19.x and classified as critical. This impacts the function tar.extractall of the file penelope.py of the component Download. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2026-50558. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in brightio penelope up to 0.19.x and classified as critical. Affected by this issue is the function tar.extractall of the file penelope.py of the component Download. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Penelope Shell Handler is a post-exploitation shell handler for authorized security testing. Prior to 0.20.0, the Unix download() implementation in penelope.py used tar.extractall(local_download_folder) on tar archives returned by remote sessions without validating member paths, allowing a malicious or compromised session to write files outside the intended download directory and potentially overwrite ~/.penelope/peneloperc. This issue is fixed in version 0.20.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-50558 since 06/04/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 0.20.0 eliminates this vulnerability.

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Productinfo

Vendor

• brightio

Name

• penelope

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19

Website

• Product: https://github.com/brightio/penelope/

CPE 2.3info

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CPE 2.2info

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