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

Medium 5.2 Published 19 Feb 2026 Updated 20 Feb 2026

Attackers can cause crashes or leak heap data by tricking users into opening crafted files in NanaZip, requiring an upgrade to the latest version.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-26282?

CVE-2026-26282 is a medium-severity memory corruption vulnerability in M2Team NanaZip, published on 19 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-125, CWE-126

Which versions are affected by CVE-2026-26282?

It affects 1 product.

Products include M2team Nanazip.

How do I fix CVE-2026-26282?

No fix has been published for CVE-2026-26282 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-26282 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26282 exists.

Sources

Also known as GHSA-ccpc-2222-xv5c.