Description
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.
Published: 2026-11-03
Score: 6.9 Medium
EPSS: n/a
KEV: No
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History

Tue, 03 Nov 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 03 Nov 2026 18:15:00 +0000

Type Values Removed Values Added
Description 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.
Title zt-zip: ZipUtil.unpack can change file permissions of output directory
Weaknesses CWE-23
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-11-03T19:38:28.292Z

Reserved: 2026-07-16T21:49:52.069Z

Link: CVE-2026-63499

cve-icon Vulnrichment

Updated: 2026-11-03T19:38:24.466Z

cve-icon NVD

Status : Received

Published: 2026-11-03T18:18:04.083

Modified: 2026-11-03T20:18:16.777

Link: CVE-2026-63499

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-03T20:15:14Z

Weaknesses
  • CWE-23

    Relative Path Traversal