NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser

{
  "id": "bfdbf2f7f1b6377737bba22cbb36ccdff8eb43b29cc56e158ffff06949421a29",
  "url": "https://osv.dev/vulnerability/CVE-2026-44215",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser",
    "summary": "NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a one-byte heap out-of-bounds null write exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS filesystem image. The attacker controls the byte offset of the write within a ~254-byte window past the heap allocation boundary. This vulnerability is fixed in 6.0.1698.0.",
    "evidence": "osv:CVE-2026-44215",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-44215",
      "aliases": [
        "CVE-2026-44215",
        "GHSA-44wh-7gc3-w936"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/m2team/nanazip",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e4e8fbbc79db1280d94762c37e9037da169d76de"
                },
                {
                  "fixed": "28b2bc47eaa37f56c670c72401d97fb1178e87b8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "5.0.1250.0"
                      },
                      {
                        "fixed": "6.0.1698.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:m2team:nanazip:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.0.1252.0"
                      },
                      {
                        "fixed": "6.0.1698.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.0.1691.0",
            "6.0.1650.0",
            "6.0.1638.0",
            "6.0.1632.0",
            "6.0.1630.0",
            "6.0.1621.0",
            "6.0.1461.0",
            "5.1.1263.0",
            "5.0.1263.0",
            "5.1.1252.0",
            "5.0.1252.0",
            "5.0.1250.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44215.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.148083555Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44215.json",
        "https://github.com/M2Team/NanaZip/security/advisories/GHSA-44wh-7gc3-w936",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44215"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-787"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44215.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44215",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519836,
  "published_at": "2026-05-12T19:23:43.798+00:00"
}