CVE-2026-47222CWE-125CWE-191

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

Medium · published June 12, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
20.6
In the wild
Unconfirmed
What it 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). 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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00292 · 20.6th percentile
Weaknesses
CWE-125 · Out-of-bounds Read; CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-06-12T16:56Z
EPSS history
Timeline
  • 12 JUN 16:56Z
    NanaZip: Heap out-of-bounds read in NanaZip AVB property descriptor parser via unsigned integer underflow
    cvelistv5