GHSA-hcwr-pq9g-rq3m
apko doesn't verify downloaded apk packages against APKINDEX checksum (package substitution possible)
Quick fix
GHSA-hcwr-pq9g-rq3m — chainguard.dev/apko: upgrade to the fixed version with the command below.
go get chainguard.dev/apko@v1.2.7Details
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.
Are you affected?
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Affected packages
References
- https://github.com/chainguard-dev/apko/security/advisories/GHSA-hcwr-pq9g-rq3m[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-42575[ADVISORY]
- https://github.com/chainguard-dev/apko/commit/a118c3d604107532b5525bd4bee2fb369a6228aa[WEB]
- https://github.com/chainguard-dev/apko[PACKAGE]
- https://github.com/chainguard-dev/apko/releases/tag/v1.2.7[WEB]