Is CVE-2026-85396 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-85396?

CVE-2026-85396 has a CVSS v3 severity of HIGH (7.5).

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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.