CVE-2026-63436
zt-zip: Path traversal in fluent API unpack
zt-zip is a Java library that provides convenience methods for ZIP archive manipulation. Prior to 1.18.0, the Zips.get(zip).unpack().destination(outputDir).process() fluent API in src/main/java/org/zeroturnaround/zip/Zips.java constructs output files directly from ZIP entry names without applying the destination-boundary validation used by ZipUtil.unpack(...). A crafted entry containing parent-directory traversal can therefore write outside outputDir through both the normal copy branch and the ZipEntryTransformer branch. Applications that extract untrusted archives only through ZipUtil.unpack(...) are unaffected because that API already calls checkDestinationFileForTraversal. This issue is fixed in version 1.18.0.
Fixes and workarounds
Fix
org.zeroturnaround:zt-zip (maven): GitHub reports patched versions 1.18.0. Check the advisory for the affected release branch.
Source: GitHub GHSA-52c6-99qm-3hqrAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| zt-zip zeroturnaround |
< 1.18.0 (affected) | CNA: GitHub_M |
org.zeroturnaround:zt-ziporg.zeroturnaround:zt-zip
maven |
<= 1.17 (affected, GitHub advisory range) | GitHub GHSA-52c6-99qm-3hqr |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.1 medium |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L | CNA: GitHub_M |
| 3.1 / 6.1 medium |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L | NVD: [email protected] |
Exploit evidence
- https://github.com/zeroturnaround/zt-zip/security/advisories/GHSA-52c6-99qm-3hqr
exploit · ADP: CISA-ADP
References
- https://github.com/zeroturnaround/zt-zip/security/advisories/GHSA-52c6-99qm-3hqrCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/zeroturnaround/zt-zip/pull/180CNA: GitHub_M · x_refsource_MISC
- https://github.com/zeroturnaround/zt-zip/commit/59a76ad576b0fcd50ea018e3608afb946c1492fdCNA: GitHub_M · x_refsource_MISC
- https://github.com/zeroturnaround/zt-zip/releases/tag/v1.18.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/zeroturnaround/zt-zip/security/advisories/GHSA-52c6-99qm-3hqrADP: CISA-ADP · exploit
- https://github.com/zeroturnaround/zt-zip/commit/59a76ad576b0fcd50ea018e3608afb946c1492fd[email protected]
- https://github.com/zeroturnaround/zt-zip/pull/180[email protected]
- https://github.com/zeroturnaround/zt-zip/releases/tag/v1.18.0[email protected]
- https://github.com/zeroturnaround/zt-zip/security/advisories/GHSA-52c6-99qm-3hqr[email protected]
- https://github.com/zeroturnaround/zt-zip/security/advisories/GHSA-52c6-99qm-3hqrGitHub Security Advisories · advisory
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.