CVE-2026-42445 NanaZip: Uncontrolled recursion in NanaZip UFS directory traversal causes stack exhaustion

Low 3.3 Published 12 May 2026 Updated 14 May 2026

Attackers can crash NanaZip by providing a crafted UFS image with deep directory structures, causing stack exhaustion via uncontrolled recursion.

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

What is CVE-2026-42445?

CVE-2026-42445 is a low-severity denial of service vulnerability in M2Team NanaZip, published on 12 May 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. From 5.0.1252.0 to before 6.0.1698.0, an uncontrolled recursion vulnerability exists in the UFS/UFS2 filesystem image parser in NanaZip. The function GetAllPaths recurses into subdirectories without any depth limit or visited-inode tracking. A crafted UFS image with a deep directory tree or an inode cycle causes stack exhaustion, crashing the NanaZip process. This vulnerability is fixed in 6.0.1698.0.

Weakness: CWE-674

Which versions are affected by CVE-2026-42445?

It affects 1 product.

Products include M2team Nanazip.

How do I fix CVE-2026-42445?

No fix has been published for CVE-2026-42445 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-42445 being exploited?

There is no known exploitation of CVE-2026-42445 in the wild and no public exploit code.

Sources

Also known as GHSA-jpf5-j78p-cp3x.