What is CVE-2026-29049?

CVE-2026-29049 is a medium-severity vulnerability in Chainguard Melange, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2026-03-06.

How severe is CVE-2026-29049?

Medium severity. CVSS v3 base score is 4.3 out of 10.

SSRF in Chainguard Melange

CVE-2026-29049

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.

Vulnerability class: DoS (Denial of Service)

Published 2026-03-06 · last modified 2026-07-07.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.002 (14.0th percentile), scored 2026-10-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.002 · change: -0.002

Affected products

Chainguard Melange
Chainguard-Dev Melange — versions < 0.43.4, <= 0.40.5

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-29049?: CVE-2026-29049 is a medium-severity vulnerability in Chainguard Melange, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2026-03-06.
How severe is CVE-2026-29049?: Medium severity. CVSS v3 base score is 4.3 out of 10.