Vulnerability Description
rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/geo-chen/oss/blob/main/rubyzip.md
- https://github.com/rubyzip/rubyzip
- https://github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rb
- https://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da634
- https://github.com/rubyzip/rubyzip/releases/tag/v3.4.0
- https://www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-
FAQ
What is CVE-2026-85396?
CVE-2026-85396 is a vulnerability with a CVSS score of 7.5 (HIGH). rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attacke...
How severe is CVE-2026-85396?
CVE-2026-85396 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-85396?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.