TI-2026-30855 Aliases CVE-2026-42575 GHSA-hcwr-pq9g-rq3m

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

LOW 38CWE-345Published 2026-05-09 · Updated 2026-05-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass, Code execution
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-345 and CWE-494.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00159 5th percentileScored 2026-11-07

Fix Fixed apko (chainguard-dev): 1.2.7chainguard.dev/apko (Go): 1.2.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
chainguard-dev	apko	before 1.2.7	1.2.7	Patch available	CNA
—	chainguard.dev/apko (Go)	before 1.2.7	1.2.7	Patch available	GHSA-hcwr-pq9g-rq3m

apko Vendorchainguard-dev Affected before 1.2.7 Fixed in 1.2.7 Patch available CNA
chainguard.dev/apko (Go) Vendor— Affected before 1.2.7 Fixed in 1.2.7 Patch available GHSA-hcwr-pq9g-rq3m

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:chainguard:apko::::::::	—	—	chainguard-dev

cpe:2.3:a:chainguard:apko:*:*:*:*:*:*:*:* Versions — — ·chainguard-dev

Remediation

Fix · CNA apko (chainguard-dev) Fixed in 1.2.7
Fix · GHSA-hcwr-pq9g-rq3m chainguard.dev/apko (Go) Fixed in 1.2.7 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-42575
2026-10-03 Alias added: GHSA-hcwr-pq9g-rq3m

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-42575

Other 4

TI-2024-23955 apko Exposure of HTTP basic auth credentials in log output CVSS 3.1HIGH 7.5
TI-2026-22680 kaniko has tar archive path traversal in build context extraction allows writing files outside destination directory CVSS 3.1HIGH 8.2
TI-2026-83911 kaniko sends Azure access tokens to lookalike ACR registry hosts CVSS 3.1CRITICAL 9.3
TI-2026-30854 apko dirFS has a symlink-following path traversal that allows multiple entry points to escape the build root CVSS 3.1HIGH 7.5
TI-2026-20302 apko affected by potential unbounded resource consumption in expandapk.ExpandApk on attacker-controlled .apk streams CVSS 3.1HIGH 7.5
TI-2026-20284 apko is vulnerable to path traversal in apko dirFS which allows filesystem writes outside base CVSS 3.1HIGH 7.5

See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences