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    CVE-2026-85396

    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.

    Published:Sep 3, 2026
    Last Modified:Sep 4, 2026
    EPS:Sep 3, 2026
    EPSS Score:0.00383
    CVSS Score:7.5

    Affected Products

    Vendor
    Rubyzip
    Product
    Rubyzip
    Vendor
    Rubyzip Project
    Product
    Rubyzip

    Exploits

    No exploit reference

    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