NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser

NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0.

Problem type

CWE-125: Out-of-bounds Read

Affected products

M2Team

NanaZip

>= 5.0.1250.0, < 6.0.1698.0 - AFFECTED

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9

https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9

x_refsource_CONFIRM

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-42446

Click to expand

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-42446",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-05-12T19:19:44.822Z",
    "dateReserved": "2026-04-27T13:55:58.693Z",
    "datePublished": "2026-05-12T19:19:44.822Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-05-12T19:19:44.822Z"
      },
      "title": "NanaZip: Stack out-of-bounds read in NanaZip ZealFS bitmap parser",
      "descriptions": [
        {
          "lang": "en",
          "value": "NanaZip is an open source file archive. From 5.0.1252.0 to before 6.0.1698.0, a stack-based out-of-bounds read exists in the ZealFS filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted ZealFS v1 filesystem image. An attacker-controlled BitmapSize field in the file header drives an unbounded loop that reads past the end of a stack-allocated ZEALFS_V1_HEADER structure. This vulnerability is fixed in 6.0.1698.0."
        }
      ],
      "affected": [
        {
          "vendor": "M2Team",
          "product": "NanaZip",
          "versions": [
            {
              "version": ">= 5.0.1250.0, < 6.0.1698.0",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-125: Out-of-bounds Read",
              "cweId": "CWE-125",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9",
          "name": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-4c79-hfr4-mqv9",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L",
            "attackVector": "LOCAL",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "REQUIRED",
            "scope": "UNCHANGED",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "availabilityImpact": "LOW",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM"
          }
        }
      ]
    }
  }
}