{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.0.88.0"
              },
              {
                "fixed": "6.0.1698.0"
              },
              {
                "introduced": "6.5.1638.0"
              },
              {
                "fixed": "6.5.1742.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "eeb2aea2642e57ceb55c1b7fe287078cfc61730d"
            },
            {
              "fixed": "28b2bc47eaa37f56c670c72401d97fb1178e87b8"
            },
            {
              "fixed": "3d7eabe2de2c49a3080f7063fa1d25d4ceb9e903"
            },
            {
              "fixed": "733e8570d2ba96c3e52aab44f5fd886775d5952f"
            },
            {
              "fixed": "ce0322a1932e16a53e4a13e48bc61804c7826956"
            }
          ],
          "repo": "https://github.com/m2team/nanazip",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-95x5-qvvm-hmfp"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54616.json"
  },
  "details": "NanaZip is the 7-Zip derivative intended for the modern Windows experience. From version 1.0.88.0 until stable version 6.0.1698.0 and preview version 6.5.1742.0, the Lz4Decode function in NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp rejects only a zero return from LZ4_decompress_safe even though malformed input produces a negative error value. The negative int is converted to the unsigned SizeT destLen and then truncated into outBufWasWrittenSize, causing ReadBlock to trust an attacker-inflated _cachedUnpackBlockSize. During fragment extraction, an attacker-controlled inode Offset can make memcpy read beyond the _cachedBlock heap allocation and place adjacent heap contents in the extracted file, or crash the process. This issue is fixed in stable version 6.0.1698.0 and preview version 6.5.1742.0.",
  "id": "CVE-2026-54616",
  "modified": "2026-08-22T03:31:09.563327418Z",
  "published": "2026-08-20T16:11:54.192Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54616.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54616"
    },
    {
      "type": "FIX",
      "url": "https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "NanaZip: Heap out-of-bounds read in NanaZip SquashFS LZ4 decompressor via unchecked negative return value"
}