CVE-2026-63499
Severity not reportedzt-zip is a Java library that provides convenience methods for ZIP archive manipulation.
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.
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/zeroturnaround/zt-zip/commit/1b625467b4c3cd3a9bee9efc35bdef2f8d9c8dad security-advisories@github.com
- https://github.com/zeroturnaround/zt-zip/pull/191 security-advisories@github.com
- https://github.com/zeroturnaround/zt-zip/releases/tag/v1.18.1 security-advisories@github.com
- https://github.com/zeroturnaround/zt-zip/security/advisories/GHSA-v2g6-7r9j-v6px security-advisories@github.com
- https://github.com/zeroturnaround/zt-zip/security/advisories/GHSA-v2g6-7r9j-v6px 134c704f-9b21-4f2e-91b3-4a467353bcc0