# CVE-2026-42576

## Summary

- **CVE ID:** CVE-2026-42576
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
- **CWE:** CWE-704
- **Published:** May 9, 2026
- **Last Modified:** May 11, 2026

## 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 (< 1.2.7)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._