chainguard-dev melange up to 0.40.2 retrieveWorkspace path traversal

Summaryinfo

A vulnerability categorized as critical has been discovered in chainguard-dev melange up to 0.40.2. This issue affects the function retrieveWorkspace. The manipulation results in path traversal. This vulnerability is identified as CVE-2026-24843. The attack is only possible with local access. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in chainguard-dev melange up to 0.40.2. It has been classified as critical. Affected is the function retrieveWorkspace. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity, and availability. CVE summarizes:

melange allows users to build apk packages using declarative pipelines. In version 0.11.3 to before 0.40.3, an attacker who can influence the tar stream from a QEMU guest VM could write files outside the intended workspace directory on the host. The retrieveWorkspace function extracts tar entries without validating that paths stay within the workspace, allowing path traversal via ../ sequences. This issue has been patched in version 0.40.3.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-24843 since 01/27/2026. The exploitability is told to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 0.40.3 eliminates this vulnerability. Applying the patch 6e243d0d46699f837d7c392397a694d2bcc7612b 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.

Once again VulDB remains the best source for 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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