PT-2026-136340

CVE-2026-63499

Published

2026-11-03

Updated

2026-11-09

Description by

CVSS 4.0

6.9

Medium

MetricsAV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions zt-zip versions prior to 1.18.1

Description This Java library for ZIP archive manipulation contains an issue where the unpack() function in ZipUtil can apply stored ZIP-entry permissions to the extraction output directory. This occurs when an entry name, such as / or ./, resolves to the output directory itself. Since path traversal checks allow self-referencing entries that do not escape the destination, the permission-handling process can replace restrictive directory permissions with those supplied by an attacker. This affects applications unpacking untrusted ZIP files, particularly on POSIX systems, while other supported systems use ZTFilePermissionsUtil.fetchDefaultStrategy for fallback permission handling.

Recommendations Update zt-zip to version 1.18.1.

Exploitability

Exploit

Fix

Impacts

Researchers

Vendors

Affected products

Weakness enumeration

CWE-23: Relative Path Traversal

Related identifiers

CVE-2026-63499