# CVE-2026-42442: NanaZip: Null-pointer dereference in NanaZip UFS parser when root inode is a symlink

> A crafted UFS image causes a null-pointer dereference in NanaZip, leading to application crash when opening the file.

- **Severity:** Low 3.3 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L`)
- **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 available:** No
- **Published:** 12 May 2026
- **Updated:** 13 May 2026
- **Also known as:** GHSA-8r4x-fx3w-ph77

## What is CVE-2026-42442?

CVE-2026-42442 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, a null-pointer dereference exists in the UFS/UFS2 filesystem image parser in NanaZip. The vulnerability is triggered when opening a crafted UFS image where the root inode (inode 2) is set to IFLNK (symlink) instead of IFDIR (directory). The parser unconditionally treats the root inode as a directory without checking its type, and when the symlink has an embedded target (small di_size), the directory data buffer is zero-length, causing a null-pointer dereference on the first read. This vulnerability is fixed in 6.0.1698.0.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-42442?

It affects 1 product.


Products: M2team Nanazip.

## How do I fix CVE-2026-42442?

No fix has been published for CVE-2026-42442 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-42442 being exploited?

There is no known exploitation of CVE-2026-42442 in the wild and no public exploit code.

## Other vulnerabilities in M2Team NanaZip

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

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42442 and fix it if it is affected.

What it is: CVE-2026-42442 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.
Exploitation: There is no known exploitation of CVE-2026-42442 in the wild and no public exploit code.

Affected product: M2Team NanaZip. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-42442/ (Markdown: https://insights.sbomify.com/CVE-2026-42442/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42442
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42442
- OSV: https://osv.dev/vulnerability/CVE-2026-42442

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-42442/
Summaries are generated and may contain mistakes; the official description above is the record.