apko doesn't verify downloaded apk packages against APKINDEX checksum (package substitution possible)
cve-program · CVE-2026-42575
Publishedapko 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.
Read the publisher's advisoryeuvd · EUVD-2026-28933
Publishedapko 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.
Read the publisher's advisorynvd · CVE-2026-42575
Publishedapko 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.
Read the publisher's advisoryosv · GHSA-hcwr-pq9g-rq3m
Publishedapko 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.
Read the publisher's advisoryosv · GO-2026-5422
Publishedapko doesn't verify downloaded apk packages against APKINDEX checksum (package substitution possible) in chainguard.dev/apko
Read the publisher's advisoryAffected versions, risk and source history
Related advisories and sources
Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.
CVE-2026-42575 · CVE overview and exploitation status
cve-program · CVE-2026-42575
- https://github.com/chainguard-dev/apko/security/advisories/GHSA-hcwr-pq9g-rq3m
- https://github.com/chainguard-dev/apko/commit/a118c3d604107532b5525bd4bee2fb369a6228aa
- https://github.com/chainguard-dev/apko/releases/tag/v1.2.7
euvd · EUVD-2026-28933
- https://github.com/chainguard-dev/apko/security/advisories/GHSA-hcwr-pq9g-rq3m
- https://github.com/chainguard-dev/apko/commit/a118c3d604107532b5525bd4bee2fb369a6228aa
- https://github.com/chainguard-dev/apko/releases/tag/v1.2.7
nvd · CVE-2026-42575
- https://github.com/chainguard-dev/apko/commit/a118c3d604107532b5525bd4bee2fb369a6228aa
- https://github.com/chainguard-dev/apko/releases/tag/v1.2.7
- https://github.com/chainguard-dev/apko/security/advisories/GHSA-hcwr-pq9g-rq3m
osv · GHSA-hcwr-pq9g-rq3m
- https://github.com/chainguard-dev/apko/security/advisories/GHSA-hcwr-pq9g-rq3m
- https://nvd.nist.gov/vuln/detail/CVE-2026-42575
- https://github.com/chainguard-dev/apko/commit/a118c3d604107532b5525bd4bee2fb369a6228aa
- https://github.com/chainguard-dev/apko
- https://github.com/chainguard-dev/apko/releases/tag/v1.2.7
osv · GO-2026-5422
Related changes
Linked by CVE identifierNo related changes are available here.