CVE-2026-42576

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

CVSS 6.5 MEDIUMEPSS 0.3%CWE-704

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.5EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

09 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

chainguard-dev · apko

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

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