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Vulnerability record · CVE-2026-42575 · published 9 May 2026

CVE-2026-42575: Insufficient verification of data authenticity vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.23% · top 87.1% CWE-345 · Insufficient verification of data authenticityCWE-494 · Download of code without integrity check Deferred
7.5CVSS 3.1 base score
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
24 Jul 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/chainguard-dev/apko/commit/a118c3d604107532b5525bd4bee2fb369a6228aa
https://github.com/chainguard-dev/apko/releases/tag/v1.2.7
https://github.com/chainguard-dev/apko/security/advisories/GHSA-hcwr-pq9g-rq3m

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Source: NIST National Vulnerability Database (record CVE-2026-42575), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.