CVE-2026-63436
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
37/100
Published: 2026-11-03
Modified: 2026-11-12
First seen: 2026-11-03
Status: active
Attack Surface
Low Complexity
No Auth
Integ. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
None
UI:
Required
S:
Unchanged
C:
None
I:
High
A:
Low
Description
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.
Weakness Classification (1)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| zeroturnaround | zt-zip | < 1.18.0 |
| zeroturnaround | zt-zip | < 1.18.0 |