High 7.5Published May 9, 2026

CVE-2026-42575apko doesn't verify downloaded apk packages against APKINDEX checksum (package substitution possible)

Updated under an hour ago (Oct 26, 2026, 10:23 PM ET)

Does this affect you?

It affects chainguard-dev apko. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for chainguard-dev apko

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-345, CWE-494
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: May 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

chainguard-dev apko chainguard_dev:apko (from the name)	before 1.2.7	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.