CVE-2026-24843: Chainguard Melange

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Chainguard Melange: from 0.11.3, before 0.40.5 (fixed in 0.40.5)

Published 2026-02-04. Last modified 2026-06-17.