# CVE-2026-47224: M2Team NanaZip heap buffer overflow in LVM2 metadata parser

Source: https://junglewise.ai/threats/cve-2026-47224-m2team-nanazip-heap-buffer-overflow-in-lvm2-metadata-parser  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-12. Updated: 2026-06-12  
License: CC BY 4.0 with a link back

CVE-2026-47224 · Severity: medium · CVSS 4.3 · Published 2026-06-12

NanaZip is a file archiving utility for Windows based on the 7-Zip project. A security flaw in how it handles LVM disk image files could allow an attacker to crash the application or potentially leak small amounts of information if a user is tricked into opening a specially crafted file. This occurs because the software fails to properly verify the size of certain data before reading it, which can lead to a system crash or service disruption.

Technologies: [M2Team NanaZip](https://junglewise.ai/threats/technologies/nanazip). Vendors: [M2Team](https://junglewise.ai/threats/vendors/m2team).

## Quick answers

**Is CVE-2026-47224 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-47224 being exploited in the wild.

**How severe is CVE-2026-47224?** Medium severity, with a CVSS score of 4.3, published 12 June 2026.

**Which products and versions are affected?** M2Team NanaZip 3.0.1000.0 to before 6.0.1698.0.

**Is there a fix for CVE-2026-47224?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-47224 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-47224?** Check whether you run M2Team NanaZip at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap buffer-overflow read exists in the LVM2 physical-volume metadata parser within NanaZip's LvmHandler (inherited from upstream 7-Zip but specifically enabled in NanaZip). The vulnerability is rooted in the CHandler::Open2 function in LvmHandler.cpp, where the code allocates a buffer based on an attacker-controlled size field but performs a CRC-32 check using a hardcoded length of 508 bytes. If the allocated size is less than 512 bytes, the CRC calculation reads past the end of the heap allocation. While 7-Zip contains the vulnerable code, it is not affected in its default builds because the LVM handler is disabled; NanaZip is vulnerable because it explicitly enables this handler. Attackers can trigger this by providing a malformed .lvm file, leading to a denial-of-service (crash) or a side-channel information leak via the CRC matching result.

## Affected products

- M2Team NanaZip 3.0.1000.0 to before 6.0.1698.0

## Timeline

- 2026-05-18: advisory: GitHub Security Advisory published
- 2026-06-12: disclosed: NVD publication date

## References

- [https://github.com/M2Team/NanaZip/security/advisories/GHSA-qcgf-c2vp-fwjr](https://github.com/M2Team/NanaZip/security/advisories/GHSA-qcgf-c2vp-fwjr)

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- [M2Team NanaZip NULL pointer dereference in NanaZip.Codecs archive handlers](https://junglewise.ai/threats/cve-2026-55783-m2team-nanazip-null-pointer-dereference-in-nanazip-codecs-archive)
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- [M2Team NanaZip uncaught exception in .NET single-file handler](https://junglewise.ai/threats/cve-2026-55780-m2team-nanazip-uncaught-exception-in-net-single-file-handler)