Medium severity · published Mar 6, 2026
CVE-2026-29049
melange: unbounded HTTP download in `melange update-cache` can exhaust disk in CI
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
melange · chainguard-dev
< 0.43.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-29049
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-29049
github.com
https://github.com/chainguard-dev/melange/commit/652ca5af08588f78e2d405e64b058fac8398d23f
github.com
https://github.com/chainguard-dev/melange/pull/2379
github.com
https://github.com/chainguard-dev/melange/releases/tag/v0.43.4
Vendor Advisory
https://github.com/chainguard-dev/melange/security/advisories/GHSA-7rp8-r62p-q6wc
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