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CVE-2026-85396 — Vulnerability in rubyzip — CVE Details

HIGH

rubyzip path traversal vulnerability

Published September 3, 2026Updated September 25, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published September 3, 2026 (38 days ago).
  • Last revised September 25, 2026 — 22 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update rubyzip to 3.4.0 or later
gem install rubyzip -v 3.4.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
rubyzip
rubygems
0.5.11, 0.5.12, 0.5.7, 0.5.8 (+45 more)3.4.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-85396?
rubyzip path traversal vulnerability This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-85396?
CVE-2026-85396 affects rubyzip. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-85396 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-47m2-wp7j-p9vc

Related CVEs

More RubyGems advisories

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