M2Team NanaZip up to 3.0.1000.0/6.0.1698.0/6.5.1742.0 Image Parser CByteBuffer::CopyFrom out-of-bounds

Summaryinfo

A vulnerability identified as critical has been detected in M2Team NanaZip up to 3.0.1000.0/6.0.1698.0/6.5.1742.0. Affected by this issue is the function CByteBuffer::CopyFrom of the component Image Parser. Performing a manipulation results in out-of-bounds. This vulnerability is identified as CVE-2026-47223. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in M2Team NanaZip up to 3.0.1000.0/6.0.1698.0/6.5.1742.0. This affects the function CByteBuffer::CopyFrom of the component Image Parser. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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). A 32-bit unsigned integer overflow in the bounds check pos + ht.salt_len > descSize allows an attacker-controlled salt_len field to bypass validation, causing CByteBuffer::CopyFrom to memcpy up to ~4 GiB past the end of a 64. This issue has been patched in stable version 6.0.1698.0 and preview version 6.5.1742.0.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-47223 since 05/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 6.0.1698.0 eliminates this vulnerability.

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Productinfo

Vendor

• M2Team

Name

• NanaZip

Version

• 3.0.1000
• 6.0.1698
• 6.5.1742

Website

• Product: https://github.com/M2Team/NanaZip/

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