CVE-2026-47222 | THREATINT

Description

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.

PUBLISHED Reserved 2026-05-18 | Published 2026-06-12 | Updated 2026-06-12 | Assigner GitHub_M

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Problem types

CWE-125: Out-of-bounds Read

CWE-191: Integer Underflow (Wrap or Wraparound)

Product status

>= 3.0.1000.0, < 6.0.1698.0

affected

References

github.com/...anaZip/security/advisories/GHSA-mqqj-crf3-6q37 exploit

github.com/...anaZip/security/advisories/GHSA-mqqj-crf3-6q37

cve.org (CVE-2026-47222)

nvd.nist.gov (CVE-2026-47222)

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