What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-26 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• M2Team NanaZip: from 5.0.1252.0 before 6.0.1638.0 — fixed in 6.0.1638.0

How to fix

Upgrade to a fixed version: M2Team NanaZip 6.0.1638.0. Check the vendor advisory for mitigations.

References

• https://github.com/M2Team/NanaZip/security/advisories/GHSA-vr4w-xc78-w6fv
• https://github.com/M2Team/NanaZip/security/advisories/GHSA-vr4w-xc78-w6fv

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