What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-10-26
• Weakness: CWE-125

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.

Affected products

• M2Team NanaZip: from 3.0.1000.0, < 6.0.1698.0

References

• https://github.com/M2Team/NanaZip/security/advisories/GHSA-mqqj-crf3-6q37
• https://github.com/M2Team/NanaZip/security/advisories/GHSA-mqqj-crf3-6q37

Get alerted when CVE-2026-47222 or the next vulnerability affects your stack