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Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M

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

Medium 4.3

In plain English

A medium-severity uncontrolled resource consumption in melange from chainguard-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.3%top 81.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Gochainguard.dev/melange0.43.4GHSA-7rp8-r62p-q6wc
Gochainguard.dev/melangeno fix listedGO-2026-4588

Affected products (as reported)

VendorProductVersions
chainguard-dev melange < 0.43.4

Weakness: CWE-400, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

References