{"id":"CVE-2026-47222","summary":"NanaZip: Heap out-of-bounds read in NanaZip AVB property descriptor parser via unsigned integer underflow","details":"NanaZip is the 7-Zip derivative intended for the modern Windows experience. From version 3.0.1000.0 to before version 6.0.1698.0, a heap out-of-bounds read exists in the Android Verified Boot (AVB) vbmeta image parser in NanaZip (via the upstream 7-Zip AvbHandler). An unsigned integer underflow in a bounds check allows an attacker-controlled value_num_bytes field to pass validation, causing AddNameToString to read up to ~4 GiB past the end of a 64 KiB heap buffer. This causes a deterministic crash (denial of service) when opening a crafted .avb or .img file. This issue has been patched in stable version 6.0.1698.0 and preview version 6.5.1742.0.","aliases":["GHSA-mqqj-crf3-6q37"],"modified":"2026-07-15T01:49:13.660143942Z","published":"2026-06-12T16:56:47.501Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47222.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-125","CWE-191"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47222.json"},{"type":"ADVISORY","url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-mqqj-crf3-6q37"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47222"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/m2team/nanazip","events":[{"introduced":"626d820c5f48daab54653dec3bc8eba76e976919"},{"fixed":"28b2bc47eaa37f56c670c72401d97fb1178e87b8"}],"database_specific":{"source":["AFFECTED_FIELD","DESCRIPTION"],"extracted_events":[{"introduced":"3.0.1000.0"},{"fixed":"6.0.1698.0"},{"introduced":"0"}]}}],"versions":["6.0.1691.0","6.0.1650.0","6.0.1638.0","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"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47222.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L"}]}