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

CVSS 3.1 6.5 MEDIUMEUVD CVSS 3.1 6.5 CVSS 3.1 · [email protected] · Secondary 6.5 MEDIUMCVSS_V3 Publisher rating MODERATEFixed by chainguard.dev/apko 1.2.7osv · severity unknownFixed by chainguard.dev/apko 1.2.7KEV status unknown

cve-program · CVE-2026-42576

Published

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.

Read the publisher's advisory

euvd · EUVD-2026-28934

Published

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.

Read the publisher's advisory

nvd · CVE-2026-42576

Published

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.

Read the publisher's advisory

osv · GHSA-m7hm-vm4x-28jf

Published

`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](https://1seal.org/) for discovering and reporting this issue.

Read the publisher's advisory

osv · GO-2026-5497

Published

apko `DiscoverKeys` has a panic on non-rsa jwks key that causes crash during key discovery in chainguard.dev/apko

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-42576

Published

apko

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "chainguard-dev",
                    "product": "apko",
                    "versions": [
                        {
                            "version": "< 1.2.7",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-28934

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: May 9, 2026, 7:26:56 PM

dateUpdated: May 11, 2026, 2:57:58 PM

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-42576

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Deferred

Weakness classifications: CWE-704

Original publisher date fields

published: 2026-05-09T20:16:29.717

lastModified: 2026-07-24T20:10:00.147

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-m7hm-vm4x-28jf

Published

chainguard.dev/apko

Go

SEMVER · introduced 0 → fixed 1.2.7

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GO-2026-5497

Published

chainguard.dev/apko

Go

SEMVER · introduced 0 → fixed 1.2.7

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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