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CVE-2026-55782— NanaZip: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-controlled section/name length fields

Quick assessment

Affected
M2Team NanaZip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

m2team nanazip是m2team团队开源的一个压缩软件。 M2Team NanaZip 6.5.1749.0之前版本存在资源管理错误漏洞，该漏洞源于WebAssembly存档处理器在分配缓冲区时未验证节区和自定义名称长度字段，可能导致强制分配大量内存，造成内存耗尽或进程终止。

AI Predicted 7.5 Difficulty: Easy EPSS 0.11% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
M2Team NanaZip < 6.5.1749.0 affected
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I. Basic Information for CVE-2026-55782

Vulnerability Information
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Vulnerability Title
NanaZip: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-controlled section/name length fields
Source: CVE Program / CVE List V5
Vulnerability Description
NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's WebAssembly archive handler in NanaZip.Codecs.Archive.WebAssembly.cpp allocates buffers from attacker-controlled 32-bit section and custom-name length fields without validating them against the data present in the file. A tiny crafted module can force multi-gigabyte allocations during listing or extraction through NameSize, Information.Size, and std::string or vector allocation paths, causing memory exhaustion or process termination. This issue is fixed in version 6.5.1749.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
M2Team NanaZip 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
m2team nanazip是m2team团队开源的一个压缩软件。 M2Team NanaZip 6.5.1749.0之前版本存在资源管理错误漏洞，该漏洞源于WebAssembly存档处理器在分配缓冲区时未验证节区和自定义名称长度字段，可能导致强制分配大量内存，造成内存耗尽或进程终止。
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 < 6.5.1749.0 -

II. Public POCs for CVE-2026-55782

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III. Intelligence Information for CVE-2026-55782

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Patches & Fixes for CVE-2026-55782 (3)

Vendor Advisories for CVE-2026-55782 (1)

Vendor Pages for CVE-2026-55782 (1)

Same Patch Batch · M2Team · 2026-07-10 · 4 CVEs total

CVE-2026-55780 NanaZip: Uncaught exception / unbounded allocation in NanaZip .NET single-file Extract() v
CVE-2026-55783 NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handler
CVE-2026-55781 NanaZip: Unbounded memory allocation (DoS) in NanaZip UFS parser via unvalidated fs_bsize/

IV. Related Vulnerabilities

Same product: NanaZip
Same vendor: M2Team
Same weakness: CWE-400

V. Comments for CVE-2026-55782

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