What’s Vulnerable › Vulnerabilities

CVE-2026-42576: apko `DiscoverKeys` has a panic on non-rsa jwks key that causes crash during key discovery

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-09 · updated 2026-07-24
• Weakness: CWE-704

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.

Affected products

• chainguard-dev apko: before 1.2.7

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

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