CVE-2026-42575

apko doesn't verify downloaded apk packages against APKINDEX checksum (package substitution possible)

State: Published
Severity: 7.5 High
Published: May 9, 2026
Updated: May 13, 2026
Reserved: Apr 28, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N	GitHub_M

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity
CWE-494 Download of Code Without Integrity Check

Affected Products

Product	Versions
apkochainguard-dev	< 1.2.7Affected

References

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