{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.4.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "93f9e6f217029949b00c174a40b814f9a9c44bfa"
            },
            {
              "fixed": "17edfbf4423b83211b075acc23a7d8640da63449"
            }
          ],
          "repo": "https://github.com/rubyzip/rubyzip",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85396.json"
  },
  "details": "rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.",
  "id": "CVE-2026-85396",
  "modified": "2026-09-05T03:30:33.648745592Z",
  "published": "2026-09-03T18:54:27.903Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85396.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/rubyzip/rubyzip/releases/tag/v3.4.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85396"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-entry-extract-via-sibling-directory-prefix"
    },
    {
      "type": "FIX",
      "url": "https://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rubyzip/rubyzip"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/geo-chen/oss/blob/main/rubyzip.md"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rb"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix"
}