GHSA-47m2-wp7j-p9vc

rubyzip path traversal vulnerability

Source: GitHub Advisory Database (reviewed) High CVE-2026-85396

Packages

Ecosystem	Package	Affected	Fixed in
RubyGems	rubyzip	< 3.4.0	3.4.0

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2026-85396 advisory
https://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449 web
https://github.com/geo-chen/oss/blob/main/rubyzip.md web
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rubyzip/CVE-2026-85396.yml web
https://github.com/rubyzip/rubyzip package
https://github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rb web
https://github.com/rubyzip/rubyzip/releases/tag/v3.4.0 web
https://www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-entry-extract-via-sibling-directory-prefix web