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CVE-2026-27709— NanaZip .NET Single-File Manifest Parser Vulnerable to Out-of-Bounds Read via Unchecked RelativePathLength

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.

NanaZip是M2-Team开源的一个压缩软件。 NanaZip 5.0.1252.0版本至6.0.1638.0之前版本和6.5.1638.0之前版本存在安全漏洞，该漏洞源于.NET Single File Application解析器在清单解析过程中存在越界读取漏洞，特制的捆绑包可能提供格式错误的RelativePathLength，导致解析器从HeaderBuffer之外的内存构造std::string，可能引发崩溃和进程内存泄露。

AI Predicted 7.8 Difficulty: Easy EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2026-27709

Vulnerability Information
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Vulnerability Title
NanaZip .NET Single-File Manifest Parser Vulnerable to Out-of-Bounds Read via Unchecked RelativePathLength
Source: CVE Program / CVE List V5
Vulnerability Description
NanaZip is an open source file archive. Starting in version 5.0.1252.0 and prior to versions 6.0.1638.0 and 6.5.1638.0, NanaZip’s `.NET Single File Application` parser has an out-of-bounds read vulnerability in manifest parsing. A crafted bundle can provide a malformed `RelativePathLength` so the parser constructs a `std::string` from memory beyond `HeaderBuffer`, leading to crash and potential in-process memory disclosure. Versions 6.0.1638.0 and 6.5.1638.0 fix the issue.
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:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
NanaZip 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NanaZip是M2-Team开源的一个压缩软件。 NanaZip 5.0.1252.0版本至6.0.1638.0之前版本和6.5.1638.0之前版本存在安全漏洞，该漏洞源于.NET Single File Application解析器在清单解析过程中存在越界读取漏洞，特制的捆绑包可能提供格式错误的RelativePathLength，导致解析器从HeaderBuffer之外的内存构造std::string，可能引发崩溃和进程内存泄露。
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 >= 5.0.1252.0, < 6.0.1638.0 -

II. Public POCs for CVE-2026-27709

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III. Intelligence Information for CVE-2026-27709

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Vendor Advisories for CVE-2026-27709 (1)

Same Patch Batch · M2Team · 2026-02-25 · 3 CVEs total

CVE-2026-27710 NanaZip .NET Single-File Parser Integer Underflow Leads to Unbounded Allocation (DoS)
CVE-2026-27711 NanaZip UFS Archive Parser Memory Corruption via Unvalidated Directory Record Length

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-27709

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