{"id":"CVE-2026-54616","title":"NanaZip is the 7-Zip derivative intended for the modern Windows experience","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/SquashfsHa…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L","cwe":["CWE-125"],"published":"2026-08-20","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54616","references":[{"url":"https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f","label":"security-advisories@github.com"},{"url":"https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956","label":"security-advisories@github.com"},{"url":"https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0","label":"security-advisories@github.com"},{"url":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0","label":"security-advisories@github.com"},{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp","label":"security-advisories@github.com"},{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00443,"epssPercentile":0.35911,"ingestedAt":"2026-09-18T20:51:25.640Z","slug":"CVE-2026-54616","body":"## Overview\n\nNanaZip 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}