{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "lang": "en-US",
    "publisher": {
      "category": "coordinator",
      "contact_details": "https://www.cisa.gov/report",
      "issuing_authority": "CISA",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "title": "extract-zip unvalidated symlink path traversal",
    "tracking": {
      "current_release_date": "2026-06-26T16:08:29Z",
      "generator": {
        "engine": {
          "name": "VINCE-NT",
          "version": "1.15.0+build.89"
        }
      },
      "id": "VA-26-177-01",
      "initial_release_date": "2026-06-26T16:08:29Z",
      "status": "final",
      "version": "1.0.0",
      "revision_history": [
        {
          "number": "1.0.0",
          "summary": "Initial publication",
          "date": "2026-06-26T16:08:29Z"
        }
      ]
    },
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "notes": [
      {
        "text": "All information products included in [https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white](https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white) are provided \\\"as is\\\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see [https://us-cert.cisa.gov/tlp/](https://us-cert.cisa.gov/tlp/).",
        "title": "Legal Notice",
        "category": "legal_disclaimer"
      },
      {
        "text": "Worldwide",
        "title": "Countries and Areas Deployed",
        "category": "other"
      },
      {
        "text": "Information Technology",
        "title": "Critical Infrastructure Sectors",
        "category": "other"
      },
      {
        "text": "extract-zip does not validate symlink targets when extracting zip archives. When processing a malicious zip file containing a symlink with a relative path like '../../../../etc/passwd', extract-zip will extract the symlink without validation, allowing it to point outside the extraction directory. Depending on how extract-zip is used, an attacker could read or write to arbitrary files.",
        "title": "Risk Evaluation",
        "category": "summary"
      },
      {
        "text": "Consider using alternatives such as cthackers/adm-zip.",
        "title": "Recommended Practices",
        "category": "general"
      },
      {
        "text": "United States",
        "title": "Company Headquarters Location",
        "category": "other"
      }
    ],
    "references": [
      {
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-177-01.json",
        "summary": "Vulnerability Advisory VA-26-177-01 CSAF",
        "category": "self"
      }
    ]
  },
  "product_tree": {
    "branches": [
      {
        "category": "vendor",
        "name": "max-mapper",
        "branches": [
          {
            "category": "product_name",
            "name": "extract-zip",
            "branches": [
              {
                "category": "product_version_range",
                "name": "<*",
                "product": {
                  "name": "max-mapper extract-zip <*",
                  "product_id": "CSAFPID-0001"
                }
              }
            ]
          }
        ]
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-56876",
      "cwe": {
        "id": "CWE-22",
        "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
      },
      "notes": [
        {
          "category": "summary",
          "text": "extract-zip does not validate symlink targets when extracting zip archives. When processing a malicious zip file containing a symlink with a relative path like '../../../../etc/passwd', extract-zip will extract the symlink without validation, allowing it to point outside the extraction directory. Depending on how extract-zip is used, an attacker could read or write to arbitrary files.",
          "title": "Description"
        },
        {
          "category": "details",
          "title": "SSVC",
          "text": "SSVCv2/E:P/A:N/T:T/2026-06-23T15:08:40Z/"
        }
      ],
      "title": "extract-zip unvalidated symlink path traversal",
      "product_status": {
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "github.com",
          "url": "https://github.com/ziad626/extract-zip-security-research/security/advisories/GHSA-x7jf-2287-qcpf"
        },
        {
          "category": "external",
          "summary": "VA-26-177-01",
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-177-01.json"
        },
        {
          "category": "external",
          "summary": "CVE-2026-56876",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56876"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "details": "Consider using alternatives such as cthackers/adm-zip.",
          "url": "https://github.com/cthackers/adm-zip",
          "product_ids": [
            "CSAFPID-0001"
          ]
        }
      ],
      "acknowledgments": [
        {
          "organization": "Independent",
          "names": [
            "Ziad Salah"
          ]
        }
      ],
      "release_date": "2026-06-15T00:00:00Z"
    }
  ]
}