How severe is CVE-2026-42576?

CVE-2026-42576 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-42576 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42576?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42576 have an EU (EUVD) identifier?

Yes. CVE-2026-42576 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28934.

When was CVE-2026-42576 published?

CVE-2026-42576 was published on 2026-05-09 and last updated on 2026-06-17.

CVE-2026-42576

CVE-2026-42576 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-704.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28934
Weakness: CWE-704
Published: 2026-05-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-42576?: 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.
How severe is CVE-2026-42576?: CVE-2026-42576 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-42576 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42576?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42576 have an EU (EUVD) identifier?: Yes. CVE-2026-42576 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28934.
When was CVE-2026-42576 published?: CVE-2026-42576 was published on 2026-05-09 and last updated on 2026-06-17.

References

Other CWE-704 (Incorrect Type Conversion or Cast) vulnerabilities

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CVE-2025-41646 — Critical (CVSS 9.8): An unauthorized remote attacker can bypass the authentication of the affected software package by misusing an incorrect…
CVE-2021-33318 — Critical (CVSS 9.8): An Input Validation Vulnerability exists in Joel Christner .NET C# packages WatsonWebserver, IpMatcher 1.0.4.1 and…
CVE-2020-25576 — Critical (CVSS 9.8): An issue was discovered in the rand_core crate before 0.4.2 for Rust. Casting of byte slices to integer slices…
CVE-2020-6151 — Critical (CVSS 9.8): A memory corruption vulnerability exists in the TIFF handle_COMPRESSION_PACKBITS functionality of Accusoft ImageGear…

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