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CVE-2026-50558

5.9 · MEDIUM

Penelope Shell Handler is a post-exploitation shell handler for authorized security testing.

Published Jul 29, 2026CWE-22EPSS 0.37%

Overview

CVE-2026-50558 is a medium-severity vulnerability. It was published on July 29, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/brightio/penelope/commit/a040afb5db32c7e80b5e8a2f9b2164cf911cfa62GitHubgithub.com/brightio/penelope/releases/tag/v0.20.0GitHubgithub.com/brightio/penelope/security/advisories/GHSA-f42x-p2mx-hm8rGitHubgithub.com/brightio/penelope/security/advisories/GHSA-f42x-p2mx-hm8r

How CyberStrike helps

Frequently asked questions

What is CVE-2026-50558?

CVE-2026-50558 is a medium-severity vulnerability. It was published on July 29, 2026 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2026-50558?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-50558?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-50558?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-50558 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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