{"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"}}]}}