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.
- 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
- None listed
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
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.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-42148 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42148 exists.
Sources
Also known as GHSA-x9qh-w4c4-54f9.