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CVE-2026-54616— NanaZip: Heap out-of-bounds read in NanaZip SquashFS LZ4 decompressor via unchecked negative return value

Quick assessment

Affected
M2Team NanaZip
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

M2-Team NanaZip是M2-Team组织开源的一个压缩软件。 M2-Team NanaZip 1.0.88.0至6.0.1698.0之前版本和6.5.1638.0至6.5.1742.0之前版本存在缓冲区错误漏洞，该漏洞源于NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp中Lz4Decode函数对LZ4_decompress_safe返回值检查不充分，导致越界读取，可能造成信息泄露或进程崩溃。

CVSS 7.1 · High EPSS 0.44% · P37

Affected Version Matrix 2

VendorProduct Version RangeStatus
M2Team NanaZip >= 1.0.88.0, < 6.0.1698.0 affected
>= 6.5.1638.0, < 6.5.1742.0 affected
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I. Basic Information for CVE-2026-54616

Vulnerability Information
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Vulnerability Title
NanaZip: Heap out-of-bounds read in NanaZip SquashFS LZ4 decompressor via unchecked negative return value
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
M2-Team NanaZip 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
M2-Team NanaZip是M2-Team组织开源的一个压缩软件。 M2-Team NanaZip 1.0.88.0至6.0.1698.0之前版本和6.5.1638.0至6.5.1742.0之前版本存在缓冲区错误漏洞，该漏洞源于NanaZip.Core/SevenZip/CPP/7zip/Archive/SquashfsHandler.cpp中Lz4Decode函数对LZ4_decompress_safe返回值检查不充分，导致越界读取，可能造成信息泄露或进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
M2Team NanaZip >= 1.0.88.0, < 6.0.1698.0 -

II. Public POCs for CVE-2026-54616

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 12673 chars
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III. Intelligence Information for CVE-2026-54616

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Patches & Fixes for CVE-2026-54616 (2)

Vendor Advisories for CVE-2026-54616 (1)

Vendor Pages for CVE-2026-54616 (2)

IV. Related Vulnerabilities

Same product: NanaZip
Same vendor: M2Team
Same weakness: CWE-125

V. Comments for CVE-2026-54616

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