CVE-2026-47222

MediumCVSS 5.4/10Last modified Oct 26, 2026

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Weakness enumeration

CWE-125CWE-191

Affected software

VendorProductVersions
M2TeamNanaZip>= 3.0.1000.0, < 6.0.1698.0

References

Timeline

Published
Jun 12, 2026
Last modified
Oct 26, 2026
NVD status
Deferred

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CVE-2026-47222: Medium severity, CVSS 5.4 | Vulnix