CVE-2026-114104

MEDIUM 5.9

adm-zip before 0.6.1 Duplicate ZIP Entry Name Validation Bypass

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

adm-zip before 0.6.1 contains an inconsistent entry resolution vulnerability that allows attackers to bypass content validation by supplying ZIP archives with duplicate entry names. Attackers can craft archives where getEntry() returns the last duplicate while extractAllTo() writes the first, causing unvalidated bytes to be written to disk.

CWE	CWE-436
Vendor	cthackers
Product	adm-zip
Published	Oct 21, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

cthackers / adm-zip

0 < 0.6.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cthackers/adm-zip/security/advisories/GHSA-p634-w6r4-rjp2 vulncheck.com: https://www.vulncheck.com/advisories/adm-zip-before-0.6.1-duplicate-zip-entry-name-validation-bypass

Credits

🔍 zikk090