CVE-2026-42443 NanaZip: Integer divide-by-zero in NanaZip UFS inode offset calculation

What is CVE-2026-42443?

CVE-2026-42443 is a low-severity 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 integer divide-by-zero exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the superblock field fs_ipg (inodes per cylinder group) is set to zero. The parser uses this attacker-controlled value as a divisor without validation, causing an immediate hardware trap and process crash. This vulnerability is fixed in 6.0.1698.0.

Weakness: CWE-369

Which versions are affected by CVE-2026-42443?

It affects 1 product.

Products include M2team Nanazip.

How do I fix CVE-2026-42443?

No fix has been published for CVE-2026-42443 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-42443 being exploited?

There is no known exploitation of CVE-2026-42443 in the wild and no public exploit code.

Other vulnerabilities in M2Team NanaZip

• CVE-2026-26282 NanaZip has DotNet Single file OOB Heap Read Medium 5.2
• CVE-2026-27709 NanaZip .NET Single-File Manifest Parser Vulnerable to Out-of-Bounds Read via Unchecked RelativePathLength Medium 5.1
• CVE-2026-27710 NanaZip .NET Single-File Parser Integer Underflow Leads to Unbounded Allocation (DoS) Medium 5.1
• CVE-2026-27711 NanaZip UFS Archive Parser Memory Corruption via Unvalidated Directory Record Length Medium 5.1
• CVE-2026-27014 NanZip has ROMFS Archive Infinite Loop / Stack Overflow Medium 5.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3x2h-gqqw-g3gm.