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CVE-2026-55783— NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive

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之前版本存在异常处理不当漏洞，该漏洞源于无条件解引用调用者提供的Indices数组，可能导致空指针解引用，从而造成进程崩溃。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 1

VendorProduct Version RangeStatus
M2Team NanaZip < 6.5.1749.0 affected
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I. Basic Information for CVE-2026-55783

Vulnerability Information
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Vulnerability Title
NanaZip: NULL pointer dereference in Extract() of all seven NanaZip custom archive handlers when extracting/testing the whole archive
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 seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. 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
空指针解引用
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之前版本存在异常处理不当漏洞，该漏洞源于无条件解引用调用者提供的Indices数组，可能导致空指针解引用，从而造成进程崩溃。
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-2026-55783

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III. Intelligence Information for CVE-2026-55783

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Patches & Fixes for CVE-2026-55783 (1)

Vendor Advisories for CVE-2026-55783 (1)

Vendor Pages for CVE-2026-55783 (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-2026-55782 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-476

V. Comments for CVE-2026-55783

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