{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-54616", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-15T20:07:02.184Z", "datePublished": "2026-08-20T16:11:54.192Z", "dateUpdated": "2026-08-20T19:52:07.850Z"}, "containers": {"cna": {"title": "NanaZip: Heap out-of-bounds read in NanaZip SquashFS LZ4 decompressor via unchecked negative return value", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"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"}}], "references": [{"name": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp"}, {"name": "https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f", "tags": ["x_refsource_MISC"], "url": "https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f"}, {"name": "https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956", "tags": ["x_refsource_MISC"], "url": "https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956"}, {"name": "https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0"}, {"name": "https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0"}], "affected": [{"vendor": "M2Team", "product": "NanaZip", "versions": [{"version": ">= 1.0.88.0, < 6.0.1698.0", "status": "affected"}, {"version": ">= 6.5.1638.0, < 6.5.1742.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-20T16:11:54.192Z"}, "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."}], "source": {"advisory": "GHSA-95x5-qvvm-hmfp", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-20T19:52:01.141088Z", "id": "CVE-2026-54616", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-20T19:52:07.850Z"}}]}}

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{"affected": [{"affectedData": [{"product": "NanaZip", "vendor": "M2Team", "versions": [{"status": "affected", "version": ">= 1.0.88.0, < 6.0.1698.0"}, {"status": "affected", "version": ">= 6.5.1638.0, < 6.5.1742.0"}]}], "source": "[email protected]"}], "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": "[email protected]", "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": "[email protected]", "url": "https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f"}, {"source": "[email protected]", "url": "https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956"}, {"source": "[email protected]", "url": "https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0"}, {"source": "[email protected]", "url": "https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0"}, {"source": "[email protected]", "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": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "[email protected]", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.0.88.0,6.0.1698.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.5.1638.0,6.5.1742.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NanaZip", "source": "cna", "vendor": "M2Team"}, "product": "nanazip", "vendor": "m2team"}], "created": "2026-08-20T18:45:02.953338+00:00", "updated": "2026-08-20T20:45:04.598755+00:00", "vendors": ["m2team", "m2team$PRODUCT$nanazip"]}