# CVE-2026-42148: Coolify: Command Injection via Unescaped Version String in Docker Build

> Attackers can execute arbitrary commands on the server by injecting malicious input into the Docker build helper version string.

- **Severity:** Low 3.8 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 6 Jul 2026
- **Updated:** 7 Jul 2026
- **Also known as:** GHSA-x9qh-w4c4-54f9

## What is CVE-2026-42148?

CVE-2026-42148 is a low-severity command injection vulnerability in coollabsio coolify, published on 6 Jul 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

Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to 4.0.0-beta.474, the buildHelperImage method in app/Livewire/Settings/Index.php constructs a Docker build command using the dev_helper_version field without shell escaping, allowing an attacker who can set the helper version and trigger the helper image build in a development environment to execute arbitrary commands on the server. This issue is fixed in version 4.0.0-beta.474.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-42148?


## How do I fix CVE-2026-42148?

No fix has been published for CVE-2026-42148 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-42148 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42148 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42148 and fix it if it is affected.

What it is: CVE-2026-42148 is a low-severity command injection vulnerability in coollabsio coolify, published on 6 Jul 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42148 exists.

Affected product: coollabsio coolify. 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-2026-42148/ (Markdown: https://insights.sbomify.com/CVE-2026-42148/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42148
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42148
- OSV: https://osv.dev/vulnerability/CVE-2026-42148

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-42148/
Summaries are generated and may contain mistakes; the official description above is the record.