What is CVE-2023-39138?

CVE-2023-39138 is a high-severity vulnerability in Peakstep Zipfoundation, classified under Path Traversal. CVSS score: 7.8/10. Published 2023-08-30.

How severe is CVE-2023-39138?

High severity. CVSS v3 base score is 7.8 out of 10.

Path Traversal in Peakstep Zipfoundation

CVE-2023-39138

An issue in ZIPFoundation v0.9.16 allows attackers to execute a path traversal via extracting a crafted zip file.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2023-08-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (33.0th percentile), scored 2026-10-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Peakstep Zipfoundation — versions 0.9.16

Weakness classification (CWE)

CWE-22 — Path Traversal

References

github.com/weichsel/ZIPFoundation/issues/282 (Issue Tracking)
blog.ostorlab.co/zip-packages-exploitation.html (Exploit)
ostorlab.co/vulndb/advisory/OVE-2023-4 (Exploit)
ostorlab.co/vulndb/advisory/OVE-2023-6 (Exploit)

Frequently asked questions

What is CVE-2023-39138?: CVE-2023-39138 is a high-severity vulnerability in Peakstep Zipfoundation, classified under Path Traversal. CVSS score: 7.8/10. Published 2023-08-30.
How severe is CVE-2023-39138?: High severity. CVSS v3 base score is 7.8 out of 10.