CVE-2026-42575 Details
Description
apko allows users to build and publish OCI container images built from apk packages. Prior to version 1.2.7, apko verifies the signature on APKINDEX.tar.gz but never compares individually downloaded .apk packages against the checksum recorded in the signed index. The checksum is parsed and available via ChecksumString(), and the downloaded package control hash is computed, but the two values are never compared in getPackageImpl(). Mismatched packages are silently accepted. An attacker who can substitute download responses (compromised mirror, HTTP repository, poisoned CDN cache) can install arbitrary packages into built images. This issue has been patched in version 1.2.7.
A vulnerability in Apko versions prior to 1.2.7 allows for the installation of arbitrary packages into OCI container images. While Apko verifies the signature of the APKINDEX.tar.gz file, it fails to compare the checksums of individually downloaded .apk packages against those recorded in the signed index. This oversight enables an attacker to exploit compromised mirrors, HTTP repositories, or poisoned CDN caches to substitute package contents without detection. The issue has been patched in version 1.2.7.
Users can upgrade to Apko version 1.2.7 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 9, 2026CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/chainguard-dev/apko/commit/a118c3d604107532b5525bd4bee2fb369a6228aa | [email protected] | Source CodeVendor |
| https://github.com/chainguard-dev/apko/releases/tag/v1.2.7 | [email protected] | Release NotesVendor |
| https://github.com/chainguard-dev/apko/security/advisories/GHSA-hcwr-pq9g-rq3m | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-345 | Insufficient Verification of Data Authenticity | [email protected] |
| CWE-494 | Download of Code Without Integrity Check | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| chainguard.dev/apko | All versions |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 9, 2026 | New CVE Received | [email protected] |