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CVE-2026-47222— NanaZip: Heap out-of-bounds read in NanaZip AVB property descriptor parser via unsigned integer underflow

Quick assessment

Affected
M2Team NanaZip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

m2team nanazip是m2team团队开源的一个压缩软件。 M2Team NanaZip 3.0.1000.0版本至6.0.1698.0之前版本存在安全漏洞，该漏洞源于Android Verified Boot(AVB)vbmeta image parser中的堆越界读取和边界检查中的整数下溢，可能导致攻击者控制的value_num_bytes字段通过验证，在打开特制.avb或.img文件时造成确定性崩溃（拒绝服务）。

CVSS 5.4 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
M2Team NanaZip >= 3.0.1000.0, < 6.0.1698.0 affected
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I. Basic Information for CVE-2026-47222

Vulnerability Information
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Vulnerability Title
NanaZip: Heap out-of-bounds read in NanaZip AVB property descriptor parser via unsigned integer underflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
M2Team NanaZip 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
m2team nanazip是m2team团队开源的一个压缩软件。 M2Team NanaZip 3.0.1000.0版本至6.0.1698.0之前版本存在安全漏洞，该漏洞源于Android Verified Boot(AVB)vbmeta image parser中的堆越界读取和边界检查中的整数下溢，可能导致攻击者控制的value_num_bytes字段通过验证，在打开特制.avb或.img文件时造成确定性崩溃（拒绝服务）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
M2Team NanaZip >= 3.0.1000.0, < 6.0.1698.0 -

II. Public POCs for CVE-2026-47222

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III. Intelligence Information for CVE-2026-47222

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Vendor Advisories for CVE-2026-47222 (1)

Same Patch Batch · M2Team · 2026-06-12 · 3 CVEs total

CVE-2026-47223 5.4 MEDIUM NanaZip: Heap out-of-bounds read in NanaZip AVB hashtree descriptor parser via 32-bit unsi
CVE-2026-47224 4.3 MEDIUM NanaZip: Heap buffer-overflow read in NanaZip LVM metadata CRC check

IV. Related Vulnerabilities

Same product: NanaZip
Same vendor: M2Team
Same weakness: CWE-125

V. Comments for CVE-2026-47222

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