CVE-2026-85396

    Dashboard / Vulnerabilities / CVE-2026-85396

    CVE-2026-85396

    Published: 3 Sept 2026Last Modified: 26 Sept 2026

    Summary: rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix

    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://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85396.json, https://github.com/rubyzip/rubyzip/releases/tag/v3.4.0, https://nvd.nist.gov/vuln/detail/CVE-2026-85396, https://www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-entry-extract-via-sibling-directory-prefix, https://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449, https://github.com/rubyzip/rubyzip, https://github.com/geo-chen/oss/blob/main/rubyzip.md, https://github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rb

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -93f9e6f217029949b00c174a40b814f9a9c44bfa

    Affected versions

    v3.3.1
    v3.3.0

    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
    CVE-2026-85396 | CVE-DB