rubyzip path traversal vulnerability
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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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-85396US | high7.5 | — | ||
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… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/geo-chen/oss/blob/main/rubyzip.mdWEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rubyzip/CVE-2026-85396.ymlWEB
- https://github.com/rubyzip/rubyzipPACKAGE
- https://github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rbWEB
- https://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449WEB
- https://github.com/rubyzip/rubyzip/releases/tag/v3.4.0WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-85396ADVISORY
- https://www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-entry-extract-via-sibling-directory-prefixWEB
scry
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