CVE-2026-27709 MEDIUM

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

Vendor M2Team
Product NanaZip
Weakness CWE-125
Published February 25, 2026
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

5.1/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction —
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 25, 2026 CVE published
February 26, 2026 Record updated