Medium 5.9Published Jul 29, 2026

CVE-2026-50558Penelope unsafe tar extraction allows arbitrary local file write via crafted session archive

Updated under an hour ago (Oct 26, 2026, 6:10 AM ET)

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It affects brightio penelope. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for brightio penelope

Exploited in the last 30 days

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.

CVSS: 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

brightio penelope brightio:penelope (from the name)	before 0.20.0	CNA record

References

https://github.com/brightio/penelope/security/advisories/GHSA-f42x-p2mx-hm8rx-refsource-confirm
https://github.com/brightio/penelope/commit/a040afb5db32c7e80b5e8a2f9b2164cf911cfa62x-refsource-misc
https://github.com/brightio/penelope/releases/tag/v0.20.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.