Answer in brief
CVE-2026-29049 records a Medium severity (CVSS 4.3) vulnerability in `melange update-cache` has unbounded HTTP download that can exhaust disk in CI in chainguard.dev/melange. The current sources do not mark it as known exploited. The current feed maps chainguard.dev/melange (go), chainguard.dev/melange (go), chainguard.dev/melange (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps chainguard.dev/melange (go), chainguard.dev/melange (go), chainguard.dev/melange (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| chainguard.dev/melangego | <0.43.4 | 0.43.4 |
| chainguard.dev/melangego | >=0 | Not reported |
| chainguard.dev/melangego | >=0 <0.43.4 | 0.43.4 |
Published upstream
Mar 2, 2026
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Jul 7, 2026
`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.
Quoted source text, attributed separately from HOL analysis.