Path Traversal in Brightio Penelope
CVE-2026-50558
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.003 (22.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L.
Affected products
- Brightio Penelope — versions < 0.20.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-50558?
- CVE-2026-50558 is a medium-severity vulnerability in Brightio Penelope, classified under Path Traversal. CVSS score: 5.9/10. Published 2026-07-29.
- How severe is CVE-2026-50558?
- Medium severity. CVSS v3 base score is 5.9 out of 10.