CVE-2026-42576

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.

Score

CVSS 3.1 6.5 Medium

Status

Deferred - security-advisories@github.com

Published

2026-05-09

Last modified

2026-05-11

Weaknesses

CWE-704

Affected products

• Apko (Chainguard-dev)

References

• https://github.com/chainguard-dev/apko/commit/6604826b19e36e9bc6e196592800fad93738f4a1
• https://github.com/chainguard-dev/apko/releases/tag/v1.2.7
• https://github.com/chainguard-dev/apko/security/advisories/GHSA-m7hm-vm4x-28jf