---
id: CVE-2026-54616
title: NanaZip is the 7-Zip derivative intended for the modern Windows experience
summary: >-
  NanaZip is the 7-Zip derivative intended for the modern Windows experience.
  From version 1.0.88.0 until stable version 6.0.1698.0 and preview version
  6.5.1742.0, the Lz4Decode function in
  NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHa…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L'
cwe:
  - CWE-125
published: '2026-08-20'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54616'
references:
  - url: >-
      https://github.com/M2Team/NanaZip/commit/733e8570d2ba96c3e52aab44f5fd886775d5952f
    label: security-advisories@github.com
  - url: >-
      https://github.com/M2Team/NanaZip/commit/ce0322a1932e16a53e4a13e48bc61804c7826956
    label: security-advisories@github.com
  - url: 'https://github.com/M2Team/NanaZip/releases/tag/6.0.1698.0'
    label: security-advisories@github.com
  - url: 'https://github.com/M2Team/NanaZip/releases/tag/6.5.1742.0'
    label: security-advisories@github.com
  - url: 'https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp'
    label: security-advisories@github.com
  - url: 'https://github.com/M2Team/NanaZip/security/advisories/GHSA-95x5-qvvm-hmfp'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00443
epssPercentile: 0.35911
ingestedAt: '2026-09-18T20:51:25.640Z'
---

## Overview

NanaZip is the 7-Zip derivative intended for the modern Windows experience. From version 1.0.88.0 until stable version 6.0.1698.0 and preview version 6.5.1742.0, the Lz4Decode function in NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp rejects only a zero return from LZ4_decompress_safe even though malformed input produces a negative error value. The negative int is converted to the unsigned SizeT destLen and then truncated into outBufWasWrittenSize, causing ReadBlock to trust an attacker-inflated _cachedUnpackBlockSize. During fragment extraction, an attacker-controlled inode Offset can make memcpy read beyond the _cachedBlock heap allocation and place adjacent heap contents in the extracted file, or crash the process. This issue is fixed in stable version 6.0.1698.0 and preview version 6.5.1742.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.