chainguard-dev melange up to 0.40.2 Configuration File pkg/config/config.go LicensingInfos copyright[].license-path path traversal

Summaryinfo

A vulnerability classified as critical has been found in chainguard-dev melange up to 0.40.2. This impacts the function LicensingInfos of the file pkg/config/config.go of the component Configuration File Handler. The manipulation of the argument copyright[].license-path leads to path traversal. This vulnerability is documented as CVE-2026-25145. The attack needs to be performed locally. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in chainguard-dev melange up to 0.40.2. This issue affects the function LicensingInfos of the file pkg/config/config.go of the component Configuration File Handler. The manipulation of the argument copyright[].license-path with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. The summary by CVE is:

melange allows users to build apk packages using declarative pipelines. From version 0.14.0 to before 0.40.3, an attacker who can influence a melange configuration file (e.g., through pull request-driven CI or build-as-a-service scenarios) could read arbitrary files from the host system. The LicensingInfos function in pkg/config/config.go reads license files specified in copyright[].license-path without validating that paths remain within the workspace directory, allowing path traversal via ../ sequences. The contents of the traversed file are embedded into the generated SBOM as license text, enabling exfiltration of sensitive data through build artifacts. This issue has been patched in version 0.40.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-25145 since 01/29/2026. The exploitation is known to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 0.40.3 eliminates this vulnerability. Applying the patch 2f95c9f4355ed993f2670bf1bb82d88b0f65e9e4 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.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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