{"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":"2026-08-04T11:51:10.843958668Z","published":"2026-07-10T16:49:26.257Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55780.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-248","CWE-400"]},"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":"1eaba2b09dfd3c78dab55e629ad4024d97d03567"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"6.5.1749.0"}],"source":"AFFECTED_FIELD"}}],"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-2026-55780.json"}}],"schema_version":"1.8.0","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"}]}