Dokku up to 0.38.1 /git/internal-functions fn-git-create-hook os command injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Dokku up to 0.38.1. This affects the function fn-git-create-hook of the file /git/internal-functions. Such manipulation leads to os command injection. This vulnerability is listed as CVE-2026-45408. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Dokku up to 0.38.1. It has been rated as critical. Affected by this issue is the function fn-git-create-hook of the file /git/internal-functions. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Dokku is a docker-powered PaaS. Prior to 0.38.2, the app name validation regex (^[a-z0-9][^/:_A-Z]*$) permits shell metacharacters. When an authenticated user pushes to a git remote with a crafted app name, the name is embedded unquoted into a bash pre-receive hook script via an unquoted heredoc (<<EOF instead of <<'EOF') in fn-git-create-hook() at plugins/git/internal-functions:378. On git push, bash interprets the semicolon as a command separator, executing arbitrary commands as the dokku user. This vulnerability is fixed in 0.38.2.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-45408 since 05/12/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 0.38.2 eliminates this vulnerability.

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Productinfo

Name

• Dokku

Version

• 0.38.0
• 0.38.1

Website

• Product: https://github.com/dokku/dokku/

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