CVE-2026-42576
Medium
Description
apko allows users to build and publish OCI container images built from apk packages. Prior to version 1.2.7, DiscoverKeys in pkg/apk/apk/implementation.go unconditionally type-asserts JWKS keys as *rsa.PublicKey without checking the key type. If a repository JWKS endpoint returns a non-RSA key (e.g. EC), the unchecked assertion panics and crashes apko. This affects any workflow that initializes the APK database and fetches repository keys. This issue has been patched in version 1.2.7.
SeverityMedium
CVSS6.5
Exploit probability—
ProductChainguard.dev/apko
PublishedMay 9, 2026
First seenMay 9, 2026
Weakness typeCWE-704CWE-704
How to fix
Update
- chainguard.dev/apko1.2.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| chainguard.dev/apkoGo | v < 1.2.7 | 1.2.7 |
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