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.
Metrics
Affected Vendors & Products
References
History
Fri, 06 Nov 2026 22:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Zeroturnaround
Zeroturnaround zt-zip |
|
| Vendors & Products |
Zeroturnaround
Zeroturnaround zt-zip |
Tue, 03 Nov 2026 20:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
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
|
Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-11-03T18:04:46.843Z
Updated: 2026-11-03T19:38:28.292Z
Reserved: 2026-07-16T21:49:52.069Z
Link: CVE-2026-63499
Updated: 2026-11-03T19:38:24.466Z
Status : Received
Published: 2026-11-03T18:18:04.083
Modified: 2026-11-03T20:18:16.777
Link: CVE-2026-63499
No data.