{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.5.1749.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5d74d90b737ac7096e5d944a5a3070c5c6a8f894"
            },
            {
              "fixed": "1eaba2b09dfd3c78dab55e629ad4024d97d03567"
            }
          ],
          "repo": "https://github.com/m2team/nanazip",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-q67r-9cfh-xc29"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55783.json"
  },
  "details": "NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.",
  "id": "CVE-2026-55783",
  "modified": "2026-07-15T01:49:13.546946523Z",
  "published": "2026-07-10T16:48:29.959Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55783.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55783"
    },
    {
      "type": "FIX",
      "url": "https://github.com/M2Team/NanaZip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive"
}