# CVE-2026-2534: Comfast CF-N1 V2 mbox-config sub_44AC4C command injection

> Remote attackers can execute arbitrary commands via the bandwidth parameter in the mbox-config CGI script of the Comfast CF-N1 V2 router.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Feb 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-cr6h-978m-qj75

## What is CVE-2026-2534?

CVE-2026-2534 is a medium-severity command injection vulnerability in Comfast CF-N1 V2, published on 16 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been found in Comfast CF-N1 V2 2.6.0.2. The affected element is the function sub_44AC4C of the file /cgi-bin/mbox-config?method=SET&section=ptest_bandwidth. The manipulation of the argument bandwidth leads to command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-2534?

It affects 1 product.


Products: Comfast Cf-N1 Firmware.

## How do I fix CVE-2026-2534?

No fix has been published for CVE-2026-2534 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2534 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2534 exists.

## Other vulnerabilities in Comfast CF-N1 V2

- [CVE-2026-2535](https://insights.sbomify.com/CVE-2026-2535/): Comfast CF-N1 V2 mbox-config sub_44AB9C command injection (medium 5.3)
- [CVE-2025-9581](https://insights.sbomify.com/CVE-2025-9581/): Comfast CF-N1 webmgnt multi_pppoe command injection (medium 5.3)
- [CVE-2025-9582](https://insights.sbomify.com/CVE-2025-9582/): Comfast CF-N1 webmgnt ntp_timezone command injection (medium 5.3)
- [CVE-2025-9583](https://insights.sbomify.com/CVE-2025-9583/): Comfast CF-N1 webmgnt ping_config command injection (medium 5.3)
- [CVE-2025-9584](https://insights.sbomify.com/CVE-2025-9584/): Comfast CF-N1 webmgnt update_interface_png command injection (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2534 and fix it if it is affected.

What it is: CVE-2026-2534 is a medium-severity command injection vulnerability in Comfast CF-N1 V2, published on 16 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2534 exists.

Affected product: Comfast CF-N1 V2. 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-2026-2534/ (Markdown: https://insights.sbomify.com/CVE-2026-2534/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2534
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2534
- OSV: https://osv.dev/vulnerability/CVE-2026-2534

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-2534/
Summaries are generated and may contain mistakes; the official description above is the record.