# CVE-2026-14818: Path traversal in ATP series firmware

> An authenticated administrator can exploit a path traversal flaw in the CLI to execute malicious configuration files on Zyxel firewalls.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Aug 2026
- **Updated:** 4 Aug 2026
- **Also known as:** GHSA-75p7-jv3w-pjpc

## What is CVE-2026-14818?

CVE-2026-14818 is a high-severity path traversal vulnerability in Zyxel ATP series firmware, published on 4 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A path traversal vulnerability in the CLI command used to execute configuration files in Zyxel ATP series firmware versions from V4.32 through V5.42 Patch 1, USG FLEX series firmware versions from V4.50 through V5.42 Patch 1, USG FLEX 50(W) series firmware versions from V4.16 through V5.42 Patch 1, and USG20(W)-VPN series firmware versions from V4.16 through V5.42 Patch 1 could allow an authenticated attacker with administrator privileges to execute a crafted malicious configuration file on an affected device.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-14818?


## How do I fix CVE-2026-14818?

No fix has been published for CVE-2026-14818 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-14818 being exploited?

There is no known exploitation of CVE-2026-14818 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-14818 and fix it if it is affected.

What it is: CVE-2026-14818 is a high-severity path traversal vulnerability in Zyxel ATP series firmware, published on 4 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-14818 in the wild and no public exploit code.

Affected product: Zyxel ATP series firmware. 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-2026-14818/ (Markdown: https://insights.sbomify.com/CVE-2026-14818/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-14818
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-14818
- OSV: https://osv.dev/vulnerability/CVE-2026-14818

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-14818/
Summaries are generated and may contain mistakes; the official description above is the record.