chainguard-dev melange up to 0.40.2 os command injection

Summaryinfo

A vulnerability identified as critical has been detected in chainguard-dev melange up to 0.40.2. Impacted is an unknown function. This manipulation causes os command injection. This vulnerability is tracked as CVE-2026-24844. The attack is restricted to local execution. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in chainguard-dev melange up to 0.40.2. It has been declared as critical. Affected by this vulnerability is some unknown functionality. 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 0.3.0 to before 0.40.3, an attacker who can provide build input values, but not modify pipeline definitions, could execute arbitrary shell commands if the pipeline uses ${{vars.*}} or ${{inputs.*}} substitutions in working-directory. The field is embedded into shell scripts without proper quote escaping. This issue has been patched in version 0.40.3.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-24844 since 01/27/2026. The exploitation appears to be easy. An attack has to be approached locally. Neither technical details nor an exploit are publicly 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 e51ca30cfb63178f5a86997d23d3fff0359fa6c8 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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