Improper Preservation of Permissions Affecting org.zeroturnaround:zt-zip package, versions [,1.18.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published4 Nov 2026
- disclosed3 Nov 2026
- creditMarcono1234
Introduced: 3 Nov 2026
NewCVE-2026-63499 (opens in a new tab)How to fix?
Upgrade org.zeroturnaround:zt-zip to version 1.18.1 or higher.
Overview
org.zeroturnaround:zt-zip is a library to process ZIP archives. Either create, modify or explode them. On disk or in memory.
Affected versions of this package are vulnerable to Improper Preservation of Permissions in the ZipUtil.unpack overloads, where an entry name that resolves to the output directory itself, such as /, passes the destination boundary check and the entry's stored file permissions are then applied to that directory. An attacker can widen access to the output directory, for example from owner only to readable, writable, and executable by every local user, by supplying an archive containing such an entry with a permissive Unix mode in its AsiExtraField extra field. Reaching this requires the application to unpack an untrusted archive, and it is not restricted to systems with POSIX file permissions, since ZTFilePermissionsUtil.fetchDefaultStrategy selects a fallback permissions strategy elsewhere.