{"id":"CVE-2026-55783","summary":"NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive","details":"NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.","aliases":["GHSA-q67r-9cfh-xc29"],"modified":"2026-07-15T01:49:13.546946523Z","published":"2026-07-10T16:48:29.959Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55783.json"},"references":[{"type":"WEB","url":"https://github.com/M2Team/NanaZip/releases/tag/6.5.1749.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55783.json"},{"type":"ADVISORY","url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-q67r-9cfh-xc29"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55783"},{"type":"FIX","url":"https://github.com/M2Team/NanaZip/commit/5d74d90b737ac7096e5d944a5a3070c5c6a8f894"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/m2team/nanazip","events":[{"introduced":"0"},{"fixed":"5d74d90b737ac7096e5d944a5a3070c5c6a8f894"},{"fixed":"1eaba2b09dfd3c78dab55e629ad4024d97d03567"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"6.5.1749.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["6.5.1742.0","6.5.1638.0","6.0.1632.0","6.0.1630.0","6.0.1621.0","6.0.1461.0","5.1.1263.0","5.0.1263.0","5.1.1252.0","5.0.1252.0","5.0.1250.0","5.0.1243.0","5.0.1215.0","5.0.1188.0","3.1.1080.0","3.5.1000.0","3.0.1000.0","3.5.996","3.0.996","3.0.756","2.1.451","2.0.450","2.0.396","2.0.376","2.0.313","1.2.253","1.2","1.2-Preview4","1.1+ServicingUpdate1-Preview3","1.1+ServicingUpdate1-Preview2","1.1+ServicingUpdate1-Preview1","1.1","1.1-Preview2-Update1","1.1-Preview2","1.1-Preview1","1.0","1.0-Preview4","1.0-Preview3","1.0-Preview2","1.0-Preview1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55783.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}