In short
- CVE-2026-42576 is a MEDIUM (CVSS 6.5) vulnerability affecting chainguard.dev/apko.
- Chance of exploitation in the next 30 days (EPSS): 0.25%, higher than 16.8% of all vulnerabilities.
- Fix: update to 1.2.7 or later.
Description
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. Affected versions <= 0.30.34.
Fix: No fix available yet.
Acknowledgements
apko thanks Oleh Konko from 1seal for discovering and reporting this issue.
NVD 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.
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