Is there a public exploit for CVE-2026-63436?

No public exploit for CVE-2026-63436 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-63436?

CVE-2026-63436 scores CVSS 6.1 (v3.1), rated medium.

What does CVE-2026-63436 affect?

CVE-2026-63436 affects zeroturnaround zt-zip.

6.1 Medium

zt-zip is a Java library that provides convenience methods for ZIP archive manipulation.

CVE-2026-63436

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.

Assessment

CVSS: 6.1 (v3.1)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 3 November 2026
Last updated: 3 November 2026
Affected: zeroturnaround · zt-zip
Assigner: GitHub_M

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

At the source

EUVD (ENISA)

References

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