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

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Summary

CVECVE-2026-42576
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-09 20:16:29 UTC
Updated2026-05-09 20:16:29 UTC
Descriptionapko 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-704 | CWE-704 CWE-704: Incorrect Type Conversion or Cast

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Chainguard-dev Apko affected < 1.2.7 Not specified

References

ReferenceSourceLinkTags
github.com/chainguard-dev/apko/releases/tag/v1.2.7 [email protected] github.com
github.com/chainguard-dev/apko/security/advisories/GHSA-m7hm-vm4x-28jf [email protected] github.com
github.com/chainguard-dev/apko/commit/6604826b19e36e9bc6e196592800fad937... [email protected] github.com
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