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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
cthackers adm-zip unaffected
Version Status Constraints
0 affected < 0.6.1
0.6.1 unaffected —

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Project Subscriptions

Vendors Products
Adm-zip Project Subscribe
Adm-zip Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Wed, 21 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Description 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.
Title adm-zip before 0.6.1 Duplicate ZIP Entry Name Validation Bypass
First Time appeared Adm-zip Project
Adm-zip Project adm-zip
Weaknesses CWE-436
CPEs cpe:2.3:a:adm-zip_project:adm-zip:*:*:*:*:*:*:*:*
Vendors & Products Adm-zip Project
Adm-zip Project adm-zip
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-21T00:37:05.291Z

Reserved: 2026-10-20T21:47:43.313Z

Link: CVE-2026-114104

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-21T01:17:36.220

Modified: 2026-10-21T01:17:36.333

Link: CVE-2026-114104

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses