CVE-2026-85396

highCVSS 7.5covered by 2 sourcesfirst seen 2026-09-03

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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Exploitation outlook

Low exploitation risk0.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.

Advisory coverage (2)

highCVE-2026-85396: rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefixmsrc · 2026-09-08
highCVE-2026-85396: rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract tha…nvd · 2026-09-03

External references

NVD record for CVE-2026-85396

CVE.org record

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