# CVE-2026-6421: Mobatek MobaXterm Home Edition msimg32.dll uncontrolled search path

> Local attackers can exploit an uncontrolled search path in msimg32.dll to execute arbitrary code, requiring high complexity and local access.

- **Severity:** High 7.3 (`CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Apr 2026
- **Updated:** 17 Apr 2026
- **Also known as:** GHSA-hf75-j846-hmxr

## What is CVE-2026-6421?

CVE-2026-6421 is a high-severity vulnerability in Mobatek MobaXterm Home Edition, published on 17 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been found in Mobatek MobaXterm Home Edition up to 26.1. This affects an unknown part in the library msimg32.dll. The manipulation leads to uncontrolled search path. An attack has to be approached locally. The attack is considered to have high complexity. It is indicated that the exploitability is difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 26.2 is able to mitigate this issue. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Weakness: CWE-427 (Uncontrolled Search Path Element), CWE-426 (Untrusted Search Path)

## Which versions are affected by CVE-2026-6421?


## How do I fix CVE-2026-6421?

No fix has been published for CVE-2026-6421 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-6421 being exploited?

There is no known exploitation of CVE-2026-6421 in the wild and no public exploit code.

Public exploit code:

- Rust-based DLL hijacking loader for MobaXterm (CVE-2026-6421) with persistence (github_poc): https://github.com/1neptune/chimera

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6421 and fix it if it is affected.

What it is: CVE-2026-6421 is a high-severity vulnerability in Mobatek MobaXterm Home Edition, published on 17 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-6421 in the wild and no public exploit code.

Affected product: Mobatek MobaXterm Home Edition. 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-2026-6421/ (Markdown: https://insights.sbomify.com/CVE-2026-6421/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6421
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6421
- OSV: https://osv.dev/vulnerability/CVE-2026-6421

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6421/
Summaries are generated and may contain mistakes; the official description above is the record.