CVE-2026-44215 NanaZip: Heap out-of-bounds write in NanaZip UFS directory parser

What is CVE-2026-44215?

CVE-2026-44215 is a medium-severity memory corruption 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, a one-byte heap out-of-bounds null write exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS filesystem image. The attacker controls the byte offset of the write within a ~254-byte window past the heap allocation boundary. This vulnerability is fixed in 6.0.1698.0.

Weakness: CWE-787

Which versions are affected by CVE-2026-44215?

It affects 1 product.

Products include M2team Nanazip.

How do I fix CVE-2026-44215?

No fix has been published for CVE-2026-44215 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-2026-44215 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44215 exists.

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-44wh-7gc3-w936.