zt-zip: Path traversal in fluent API unpack
CVSS score
6.1
EPSS probability
—
Risk score
0.6
Published
3 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
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Evidence confidence
%63
Short explanation
A path traversal vulnerability exists in the fluent API unpack function of the zt-zip Java library due to a lack of destination boundary validation.
This vulnerability allows a crafted archive entry to write files outside of the intended destination directory, leading to integrity violations.
What should be done?
- Update the zt-zip library or follow vendor advisories
- Prefer the ZipUtil.unpack(...) method for archive extraction
- Process untrusted archives using validated APIs
Chain of evidence and sources
zt-zip kütüphanesinin 1.18.0 öncesi sürümleri akışkan API açma fonksiyonunda dizin geçişi zafiyetinden etkilenmektedir.
ZipUtil.unpack(...) kullanan uygulamalar bu açıktan etkilenmemektedir çünkü bu API hedef dosya doğrulaması gerçekleştirmektedir.
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L
CWE: CWE-22
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-63436 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | zeroturnaround | zt-zip | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 6.1 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L | CVE CNA |
| 6.1 | CVSS V31 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L | NVD |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-63436 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-63436 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
6.1 / 10Vulnerability Scoring Details
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:LYama durumu bilinmiyor
Weakness Type (CWE & CAPEC)
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