CVE-2026-26282: NanaZip has DotNet Single file OOB Heap Read

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: 2026-02-19 · updated 2026-06-17
Weakness: CWE-126

Description

NanaZip is an open source file archive Starting in version 5.0.1252.0 and prior to version 6.0.1630.0, NanaZip has an out-of-bounds heap read in `.NET Single File` bundle header parser due to missing bounds check. Opening a crafted file with NanaZip causes a crash or leaks heap data to the user. Version 6.0.1630.0 patches the issue.

Affected products

M2Team NanaZip: from 5.0.1252.0 before 6.0.1630.0 — fixed in 6.0.1630.0

How to fix

Upgrade to a fixed version: M2Team NanaZip 6.0.1630.0. Check the vendor advisory for mitigations.

References

https://github.com/M2Team/NanaZip/security/advisories/GHSA-ccpc-2222-xv5c
https://github.com/user-attachments/files/25274143/poc.exe.zip

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