GitHub Advisoryadvisory · Go

GHSA-m7hm-vm4x-28jf apko `DiscoverKeys` has a panic on non-rsa jwks key that causes crash during key discovery

MEDIUM Published 2026-05-04 Modified 2026-05-13 Official page ↗
Aliases
CVE-2026-42576
Ecosystem
Go
Packages
chainguard.dev/apko
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weaknesses
CWE-704
Reviewed
2026-05-04

Affected packages

• Go chainguard.dev/apko: < 1.2.7 → fixed in 1.2.7

Description

`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. Affected versions <= 0.30.34. Fix: No fix available yet. Acknowledgements apko thanks Oleh Konko from 1seal for discovering and reporting this issue.

Related

Alias · CVE (1)

  • CVE-2026-42576 apko allows users to build and publish OCI container images built from apk packages. vulnerability

Weakness · CWE (1)

  • CWE-704 Incorrect Type Conversion or Cast weakness

References