{"cve":{"cve_id":"CVE-2026-54616","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00319,"epss_percentile":0.24233,"epss_as_of":"2026-08-26","description":"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.","published_at":"2026-08-20T16:11:54.192000Z","last_modified_at":"2026-08-20T20:17:34.867000Z","cvss_v3_score":7.1,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"poc","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-125"],"nvd_references":["https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp","https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f","https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956","https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0","https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0"],"vuln_status":"Received","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-08-20T17:42:27.513210Z","updated_at":"2026-08-22T17:48:17.394943Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"m2team","vendor_name":"M2Team","product_slug":"nanazip","product_name":"NanaZip","version_start":">= 1.0.88.0, < 6.0.1698.0","version_start_inclusive":true,"version_end":">= 1.0.88.0, < 6.0.1698.0","version_end_inclusive":true,"cpe23_uri":"cve5:m2team:nanazip:>= 1.0.88.0, < 6.0.1698.0:>= 1.0.88.0, < 6.0.1698.0"},{"vendor_slug":"m2team","vendor_name":"M2Team","product_slug":"nanazip","product_name":"NanaZip","version_start":">= 6.5.1638.0, < 6.5.1742.0","version_start_inclusive":true,"version_end":">= 6.5.1638.0, < 6.5.1742.0","version_end_inclusive":true,"cpe23_uri":"cve5:m2team:nanazip:>= 6.5.1638.0, < 6.5.1742.0:>= 6.5.1638.0, < 6.5.1742.0"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-08-20T16:11:54.192000Z","label":"CVE published","source":null},{"type":"ssvc_changed","at":"2026-08-20T20:43:27.515460Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-20T20:43:27.515460Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-08-20T20:43:27.515460Z","label":"SSVC decision revised","source":"vulnrichment"}]}