CVE-2026-29049 MEDIUM

CVE-2026-29049: melange: unbounded HTTP download in `melange update-cache` can exhaust disk in CI

Vendor Chainguard-Dev
Product melange
Weakness CWE-400
Published March 6, 2026
Last update March 9, 2026

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

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. There is no known patch publicly available.

Key dates

02Disclosure timeline

March 6, 2026 CVE published
March 9, 2026 Record updated