CVE-2026-42576 MEDIUM

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

Vendor Chainguard-Dev
Product apko
Weakness CWE-704
Published May 9, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 9, 2026 CVE published
May 11, 2026 Record updated