{"id":"CVE-2026-55780","summary":"NanaZip: Uncaught exception / unbounded allocation in NanaZip .NET single-file Extract() via unvalidated entry Size","details":"NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's .NET single-file bundle handler in NanaZip.Codecs.Archive.DotNetSingleFile.cpp sizes its extraction buffer from the bundle entry Size field, which is only checked for sign and is not validated against the real file size. A crafted bundle can cause an attacker-chosen allocation inside Extract, where std::bad_alloc or std::length_error can escape across the COM STDMETHODCALLTYPE boundary and crash the process. This issue is fixed in version 6.5.1749.0.","aliases":["GHSA-ppm9-5267-rq72"],"modified":"2026-08-12T16:41:22.381722Z","published":"2026-07-10T16:49:26.257Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-248","CWE-400"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55780.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-2026-55780.json"},{"type":"ADVISORY","url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-ppm9-5267-rq72"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55780"},{"type":"FIX","url":"https://github.com/M2Team/NanaZip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/m2team/nanazip","events":[{"introduced":"0"},{"fixed":"ad62e3b4970b9f01e924c99094d6fed7a42f849a"},{"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":{"vanir_signatures":[{"id":"CVE-2026-55780-1039cd42","signature_type":"Line","signature_version":"v1","source":"https://github.com/m2team/nanazip/commit/ad62e3b4970b9f01e924c99094d6fed7a42f849a","target":{"file":"NanaZip.Codecs/NanaZip.Codecs.Archive.DotNetSingleFile.cpp"},"deprecated":false,"digest":{"line_hashes":["315188912000115882754404373912840568709","177940120668615089161421745423354231425","138293208154897237543607965250878966507","255815476832353132545526818084132590566","72230822934347060279839640520500445430","119136196776460121848352152578145315010","116427903683559173252800947179820584100","94010410761098609881598781513680625913","134701515468151215158464127224574049419","315810737052818224549373437423691380257","186666267216079120367728101871977403844","152017617175902208498508554140292249757","79575299956671986177045065917105801872","279209230236177889309045888579406176068","109921930642278193515034058474720104008","294908209834283291070506350729945153719","81906934469131181591569157117684547537","326475409356596035881727584277319928138","126186387591407293451475717597801071379","79367413209750831416900791164368610987","252424078108871288171342700229595273240","39823970628663323615217294049242890417","209759455606900177029434796192150762760","339645066315887261716137364737623353275","304129217278324346793297817323743097076","140728430451372136360551244596546411753","259129107027915318146335482253501484467","163378525874246921743239564890505453879","269212974031789421428099975915486264603","175237493131711291472633283323163151065","33445783729109942383723512789340694163","116104722400436786173944096526014579947","112609821587657365105349932535058000098","268573617813679025818458958909193903728","228604177786423152750631582884480358186","24902853048044737428129183262901080498","202474866017284265941505877329760240005","250979059774671345138032528798654148026","130181662717215204812807417604855545044","285038014836939290716237267871333610944"],"threshold":0.9}}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55780.json","vanir_signatures_modified":"2026-08-12T16:41:22Z"}}],"schema_version":"1.9.0","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"}]}