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Medium

adm-zip through 0.6.1 Duplicate-Entry Validation Bypass via Canonically Equivalent Names

Type: advisorySources: Official CVE List

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.

Products
adm-zip
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-116137
Confirmed fixed CVEs
Not specified
Updated in this feed
28 Oct 2026, 15:13 UTC · Revision 1

Source evidence

adm-zip through 0.6.1 Duplicate-Entry Validation Bypass via Canonically Equivalent Names

core-cve · Original source

Published 25 Oct 2026, 11:51 UTC

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.

cve:CVE-2026-116137

adm-zip

Fixed versions: Not specified

Complete source record
{
  "id": "062a60cb0fefeb67f52d5dae411372568965ff17e8481c946234b794f1fdfbea",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116137",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "adm-zip through 0.6.1 Duplicate-Entry Validation Bypass via Canonically Equivalent Names",
    "summary": "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.",
    "evidence": "cve:CVE-2026-116137",
    "products": [
      {
        "name": {
          "value": "adm-zip",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-116137",
      "aliases": [
        "CVE-2026-116137"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 6.3,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "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",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE"
          }
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 3.7,
            "attackVector": "NETWORK",
            "baseSeverity": "LOW",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "integrityImpact": "LOW",
            "userInteraction": "NONE",
            "attackComplexity": "HIGH",
            "availabilityImpact": "NONE",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "vendor": "cthackers",
          "product": "adm-zip",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "versionType": "semver",
              "lessThanOrEqual": "0.6.1"
            }
          ],
          "packageURL": "pkg:npm/adm-zip",
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-25T11:51:01.980Z",
      "provider": "cve",
      "references": [
        "https://github.com/cthackers/adm-zip/issues/587",
        "https://github.com/cthackers/adm-zip",
        "https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/zipFile.js#L81-L92",
        "https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/adm-zip.js#L87",
        "https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/util/utils.js#L383",
        "https://www.vulncheck.com/advisories/adm-zip-through-0.6.1-duplicate-entry-validation-bypass-via-canonically-equivalent-names"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
          "shortName": "VulnCheck",
          "dateUpdated": "2026-10-25T11:51:01.980Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116137",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 136269,
  "published_at": "2026-10-25T11:51:01.98+00:00"
}