chainguard-dev melange up to 0.40.2 Configuration patch.yaml os command injection

Summaryinfo

A vulnerability classified as critical has been found in chainguard-dev melange up to 0.40.2. This vulnerability affects unknown code of the file pkg/build/pipelines/patch.yaml of the component Configuration Handler. This manipulation causes os command injection. This vulnerability appears as CVE-2026-25143. The attack requires local access. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in chainguard-dev melange up to 0.40.2. Affected by this vulnerability is some unknown processing of the file pkg/build/pipelines/patch.yaml of the component Configuration Handler. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

melange allows users to build apk packages using declarative pipelines. From version 0.10.0 to before 0.40.3, an attacker who can influence inputs to the patch pipeline could execute arbitrary shell commands on the build host. The patch pipeline in pkg/build/pipelines/patch.yaml embeds input-derived values (series paths, patch filenames, and numeric parameters) into shell scripts without proper quoting or validation, allowing shell metacharacters to break out of their intended context. The vulnerability affects the built-in patch pipeline which can be invoked through melange build and melange license-check operations. An attacker who can control patch-related inputs (e.g., through pull request-driven CI, build-as-a-service, or by influencing melange configurations) can inject shell metacharacters such as backticks, command substitutions $(…), semicolons, pipes, or redirections to execute arbitrary commands with the privileges of the melange build process. This issue has been patched in version 0.40.3.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-25143 since 01/29/2026. The exploitation appears to be easy. An attack has to be approached locally. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

Upgrading to version 0.40.3 eliminates this vulnerability. Applying the patch bd132535cd9f57d4bd39d9ead0633598941af030 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• chainguard-dev

Name

• melange

Version

• 0.40.0
• 0.40.1
• 0.40.2

License

• open-source

Website

• Product: https://github.com/chainguard-dev/melange/

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