CVE-2026-29049: Chainguard Melange

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

melange allows users to build apk packages using declarative pipelines. In version 0.40.5 and prior, melange update-cache downloads URIs from build configs via io.Copy without any size limit or HTTP client timeout (pkg/renovate/cache/cache.go). An attacker-controlled URI in a melange config can cause unbounded disk writes, exhausting disk on the build runne. Version 0.43.4 contains a patch.

Affected products

• Chainguard Melange: up to and including 0.40.5

Published 2026-03-06. Last modified 2026-07-07.