medium4.3
CVE-2026-29049
`melange update-cache` has unbounded HTTP download that can exhaust disk in CI
Impact
`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](https://1seal.org/) for discovering and reporting this issue.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | chainguard.dev/melange | < 0.43.4 | 0.43.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Chainguard | Melange | through 0.40.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/chainguard-dev/melange/commit/652ca5af08588f78e2d405e64b058fac8398d23f
- https://github.com/chainguard-dev/melange/pull/2379
- https://github.com/chainguard-dev/melange/releases/tag/v0.43.4
- https://github.com/chainguard-dev/melange/security/advisories/GHSA-7rp8-r62p-q6wc
- https://github.com/advisories/GHSA-7rp8-r62p-q6wc
- https://nvd.nist.gov/vuln/detail/CVE-2026-29049