UBUNTU-CVE-2026-85396

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    UBUNTU-CVE-2026-85396

    Published: 3 Sept 2026Last Modified: 16 Sept 2026
    Upstream:
    CVE-2026-85396

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2026-85396, https://www.cve.org/CVERecord?id=CVE-2026-85396, https://github.com/rubyzip/rubyzip/issues/664, https://github.com/geo-chen/oss/blob/main/rubyzip.md, https://github.com/rubyzip/rubyzip, https://github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rb, https://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449, https://github.com/rubyzip/rubyzip/releases/tag/v3.4.0, https://www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-entry-extract-via-sibling-directory-prefix

    Affected packages

    Package

    Name: ruby-zip

    Purl: pkg:deb/ubuntu/ruby-zip?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.1.7-1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-85396 | CVE-DB