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CVE-2026-55780— NanaZip: Uncaught exception / unbounded allocation in NanaZip .NET single-file Extract() via unvalidated entry Size

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之前版本存在安全漏洞，该漏洞源于.NET单文件包处理器中提取缓冲区大小仅检查符号而未验证实际文件大小，可能导致通过特制包造成攻击者选择的分配，使得std::bad_alloc或std::length_error逃逸COM STDMETHODCALLTYPE边界并导致进程崩溃。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.42% · P35

Public Exploits 1

ExploitDB · 1 EDB-52652 [dos]

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
M2Team NanaZip < 6.5.1749.0 affected
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I. Basic Information for CVE-2026-55780

Vulnerability Information
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Vulnerability Title
NanaZip: Uncaught exception / unbounded allocation in NanaZip .NET single-file Extract() via unvalidated entry Size
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 .NET single-file bundle handler in NanaZip.Codecs.Archive.DotNetSingleFile.cpp sizes its extraction buffer from the bundle entry Size field, which is only checked for sign and is not validated against the real file size. A crafted bundle can cause an attacker-chosen allocation inside Extract, where std::bad_alloc or std::length_error can escape across the COM STDMETHODCALLTYPE boundary and crash the process. 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
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
M2Team NanaZip 异常处理不当漏洞
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之前版本存在安全漏洞，该漏洞源于.NET单文件包处理器中提取缓冲区大小仅检查符号而未验证实际文件大小，可能导致通过特制包造成攻击者选择的分配，使得std::bad_alloc或std::length_error逃逸COM STDMETHODCALLTYPE边界并导致进程崩溃。
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 < 6.5.1749.0 -

II. Public POCs for CVE-2026-55780

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III. Intelligence Information for CVE-2026-55780

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Patches & Fixes for CVE-2026-55780 (1)

Vendor Advisories for CVE-2026-55780 (1)

Vendor Pages for CVE-2026-55780 (1)

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

CVE-2026-55783 NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handler
CVE-2026-55782 NanaZip: Unbounded memory allocation (DoS) in NanaZip WebAssembly parser via attacker-cont
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-248

V. Comments for CVE-2026-55780

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