chainguard-dev/melange · Security
`melange update-cache` has unbounded HTTP download that can exhaust disk in CI
- GHSA ID
- GHSA-7rp8-r62p-q6wc
- CVE ID
- CVE-2026-29049
- Severity
- medium
- Published
- Updated
- CVSS
- 4.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- CVSS v3
- 4.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Description
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 runner. Affected versions <= 0.40.5.
Fix: Merged Acknowledgements
Thank you to Oleh Konko from 1seal for discovering and reporting this issue.
CWEs
- CWE-400 · Uncontrolled Resource Consumption
- CWE-918 · Server-Side Request Forgery (SSRF)
References
- https://github.com/chainguard-dev/melange/security/advisories/GHSA-7rp8-r62p-q6wc ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-29049 ↗
- https://github.com/chainguard-dev/melange/pull/2379 ↗
- https://github.com/chainguard-dev/melange/commit/652ca5af08588f78e2d405e64b058fac8398d23f ↗
- https://github.com/chainguard-dev/melange/releases/tag/v0.43.4 ↗
- https://github.com/advisories/GHSA-7rp8-r62p-q6wc ↗