CVE-2026-63499

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    CVE-2026-63499

    Published: 3 Nov 2026Last Modified: 5 Nov 2026

    Summary: zt-zip: ZipUtil.unpack can change file permissions of output directory

    Details: zt-zip is a Java library that provides convenience methods for ZIP archive manipulation. Prior to 1.18.1, ZipUtil.unpack(...) can apply stored ZIP-entry permissions to the extraction output directory when an entry name such as / or ./ resolves to that directory itself. Because the path traversal checks permit self-referencing entries that do not escape the destination, the unpacker's permission-handling path can replace restrictive output-directory permissions with attacker-supplied permissions. This affects applications that unpack untrusted ZIP files, and POSIX systems demonstrate the issue directly, while ZTFilePermissionsUtil.fetchDefaultStrategy provides fallback permission handling on other supported systems. This issue is fixed in version 1.18.1.

    References: https://github.com/zeroturnaround/zt-zip/releases/tag/v1.18.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63499.json, https://github.com/zeroturnaround/zt-zip/security/advisories/GHSA-v2g6-7r9j-v6px, https://nvd.nist.gov/vuln/detail/CVE-2026-63499, https://github.com/zeroturnaround/zt-zip/commit/1b625467b4c3cd3a9bee9efc35bdef2f8d9c8dad, https://github.com/zeroturnaround/zt-zip/pull/191

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -b1ee08308c7cf712ddcd491609e5179d1f21f909

    Affected versions

    v1.18.0

    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-2026-63499 | CVE-DB