High severity7.5NVD Advisory· Published Sep 3, 2026· Updated Sep 24, 2026
CVE-2026-85396
CVE-2026-85396
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
rubyzipRubyGems | < 3.4.0 | 3.4.0 |
Affected products
2- Range: <3.4.0
Patches
Vulnerability mechanics
References
8- github.com/advisories/GHSA-47m2-wp7j-p9vcghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-85396ghsaADVISORY
- github.com/geo-chen/oss/blob/main/rubyzip.mdnvdWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/rubyzip/CVE-2026-85396.ymlghsaWEB
- github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rbnvdWEB
- github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449nvdWEB
- github.com/rubyzip/rubyzip/releases/tag/v3.4.0nvdWEB
- www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-entry-extract-via-sibling-directory-prefixnvdWEB
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