CVE-2026-42204: Coolify: Authenticated RCE via SHELL_SAFE_COMMAND_PATTERN regression → host root

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-06 · updated 2026-10-25
Weakness: CWE-78

Description

Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. From 4.0.0-beta.471 through 4.0.0-beta.473, a regression in SHELL_SAFE_COMMAND_PATTERN allowed ampersands in custom Docker Compose build, start, and pre/post-deployment command fields, allowing an authenticated team member to inject shell commands that execute on the host. This issue is fixed in version 4.0.0-beta.474.

Affected products

coollabsio coolify: from 4.0.0-beta.471, < 4.0.0-beta.474

References

https://github.com/coollabsio/coolify/commit/e1aac50b745cf499e710b7e35cd2a9d6a1538dd9
https://github.com/coollabsio/coolify/pull/9684
https://github.com/coollabsio/coolify/releases/tag/v4.0.0-beta.474
https://github.com/coollabsio/coolify/security/advisories/GHSA-chg4-63hm-xv9x
https://github.com/coollabsio/coolify/security/advisories/GHSA-chg4-63hm-xv9x

Get alerted when CVE-2026-42204 or the next vulnerability affects your stack