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CLEANSTART-2026-SY69656 — Security fix for CVE-2026-42575 applied in: melange 0.50.0-r1

2026-10-02T17:32:08.184158+00:00

Affected: CleanStart: melange

Security vulnerability affects the melange package. This issue is resolved in later releases. See references for vulnerability details.

EUVD-2026-318143

2026-10-02T17:32:08.184237+00:00

EUVD-2026-318143

fkie_cve-2026-42575

2026-10-02T17:32:08.184285+00:00

apko allows users to build and publish OCI container images built from apk packages. Prior to version 1.2.7, apko verifies the signature on APKINDEX.tar.gz but never compares individually downloaded .apk packages against the checksum recorded in the signed index. The checksum is parsed and available via ChecksumString(), and the downloaded package control hash is computed, but the two values are never compared in getPackageImpl(). Mismatched packages are silently accepted. An attacker who can substitute download responses (compromised mirror, HTTP repository, poisoned CDN cache) can install arbitrary packages into built images. This issue has been patched in version 1.2.7.

GHSA-hcwr-pq9g-rq3m — apko doesn't verify downloaded apk packages against APKINDEX checksum (package substitution possible)

2026-10-02T17:32:08.184342+00:00

Affected: Go: chainguard.dev/apko

apko verifies the signature on `APKINDEX.tar.gz` but never compares individually downloaded `.apk` packages against the checksum recorded in the signed index. The checksum is parsed and available via `ChecksumString()`, and the downloaded package control hash is computed, but the two values are never compared in `getPackageImpl()`. Mismatched packages are silently accepted. An attacker who can substitute download responses (compromised mirror, HTTP repository, poisoned CDN cache) can install arbitrary packages into built images.

**Fix:** No fix available yet.

**Acknowledgements**

apko thanks Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.