CVE-2026-85396

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductRubyzip

PublishedSep 3, 2026

First seenSep 3, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

rubyzip rubyzip3.4.0 or later

Patches

github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449

Vendor advisories

github.com/rubyzip/rubyzip/releases/tag/v3.4.0

Affected products

Product	Affected versions	Fixed in
rubyzip rubyzip	v < 3.4.0	3.4.0

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