CVE-2026-47223 NanaZip: Heap out-of-bounds read in NanaZip AVB hashtree descriptor parser via 32-bit unsigned integer overflow
An integer overflow in NanaZip's AVB parser allows heap out-of-bounds reads, potentially exposing memory or crashing the application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-47223?
CVE-2026-47223 is a medium-severity vulnerability in M2Team NanaZip, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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). 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.
Which versions are affected by CVE-2026-47223?
How do I fix CVE-2026-47223?
No fix has been published for CVE-2026-47223 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-47223 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47223 exists.
Sources
Also known as GHSA-qhc5-mh6j-4g75.