CVE-2026-27709

low-risk
Published 2026-02-26

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.

Do I need to act?

-
0.01% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.6/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Nanazip

Affected Vendors

M2Team

References (2)

Exploit https://github.com/M2Team/NanaZip/security/advisories/GHSA-vr4w-xc78-w6fv
Exploit https://github.com/M2Team/NanaZip/security/advisories/GHSA-vr4w-xc78-w6fv
26
/ 100
low-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal