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TI-2026-34808 Aliases CVE-2026-47222

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

Priority MEDIUM 58CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0017 6th percentileScored 2026-11-07
Fix Fixed NanaZip (M2Team): 6.0.1698.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
M2TeamNanaZip3.0.1000.0 to before 6.0.1698.06.0.1698.0Patch availableCNA
  • NanaZip VendorM2Team Affected 3.0.1000.0 to before 6.0.1698.0 Fixed in 6.0.1698.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:m2team:nanazip:*:*:*:*:*:*:*:*——M2Team
  • cpe:2.3:a:m2team:nanazip:*:*:*:*:*:*:*:* Versions — — ·M2Team

Remediation

  • Fix · CNA NanaZip (M2Team) Fixed in 6.0.1698.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47222

References

Other 1

  • TI-2026-39447 NanaZip: Heap out-of-bounds read in NanaZip SquashFS LZ4 decompressor via unchecked negative return value CVSS 3.1HIGH 7.1
  • TI-2026-32194 NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser CVSS 3.1HIGH 7.1
  • TI-2026-34809 NanaZip: Heap out-of-bounds read in NanaZip AVB hashtree descriptor parser via 32-bit unsigned integer overflow CVSS 3.1MEDIUM 5.4
  • TI-2026-30733 NanaZip: Unbounded resource consumption in NanaZip littlefs parser via attacker-controlled BlockCount CVSS 3.1MEDIUM 5.5
  • TI-2026-21251 NanaZip has DotNet Single file OOB Heap Read CVSS 4.0MEDIUM 5.2
  • TI-2026-22087 NanaZip UFS Archive Parser Memory Corruption via Unvalidated Directory Record Length CVSS 4.0MEDIUM 5.1
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences