CVE-2026-116137
adm-zip through 0.6.1 Duplicate-Entry Validation Bypass via Canonically Equivalent Names
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 25, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 25, 2026
Description
adm-zip through 0.6.1 contains a duplicate-entry validation bypass that allows attackers to evade the readEntries() check by using canonically equivalent entry names like './hello.txt' and 'hello.txt'. Attackers can craft ZIP archives where getEntry() or readAsText() validates benign content while extractAllTo() writes malicious content to the same path, bypassing integrity checks.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-436 Interpretation Conflict
Affected Products
| Product | Versions |
|---|---|
adm-zipcthackers |
|
References
- GitHub Issue #587issue-tracking
- https://github.com/cthackers/adm-zipproduct
- https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/zipFile.js#L81-L92technical-description
- https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/adm-zip.js#L87technical-description
- https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/util/utils.js#L383technical-description
- VulnCheck Advisory: adm-zip through 0.6.1 Duplicate-Entry Validation Bypass via Canonically Equivalent Namesthird-party-advisory
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