CVE-2026-47222 NanaZip: Heap out-of-bounds read in NanaZip AVB property descriptor parser via unsigned integer underflow
An attacker can cause a denial of service in NanaZip by tricking a user into opening a crafted AVB image file, exploiting an integer underflow.
- 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-2026-47222?
CVE-2026-47222 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). 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.
Which versions are affected by CVE-2026-47222?
How do I fix CVE-2026-47222?
No fix has been published for CVE-2026-47222 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-47222 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47222 exists.
Sources
Also known as GHSA-mqqj-crf3-6q37.