FKIE_CVE-2026-54616

Vulnerability from fkie_nvd - Published: 2026-08-20 17:18 - Updated: 2026-08-20 20:17
Severity
7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L
Summary
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.
References
security-advisories@github.comhttps://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f
security-advisories@github.comhttps://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956
security-advisories@github.comhttps://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0
security-advisories@github.comhttps://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0
security-advisories@github.comhttps://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "NanaZip",
          "vendor": "M2Team",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.88.0, \u003c 6.0.1698.0"
            },
            {
              "status": "affected",
              "version": "\u003e= 6.5.1638.0, \u003c 6.5.1742.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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",
  "lastModified": "2026-08-20T20:17:34.867",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-54616",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-20T19:52:01.141088Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-20T17:18:18.090",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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