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

CVSS 7.5 · High EPSS 0.02% · P5
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I. Basic Information for CVE-2026-42575

Vulnerability Information
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Vulnerability Title
apko doesn't verify downloaded apk packages against APKINDEX checksum (package substitution possible)
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对数据真实性的验证不充分
Source: NVD (National Vulnerability Database)
Vulnerability Title
apko 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
apko是apko开源的一个基于 apk 的 OCI 镜像构建器。 apko 1.2.7之前版本存在数据伪造问题漏洞，该漏洞源于验证APKINDEX.tar.gz签名但未将下载的.apk包与签名索引中的校验和进行比较，可能导致攻击者安装任意包到构建镜像中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
chainguard-devapko < 1.2.7 -

II. Public POCs for CVE-2026-42575

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 7824 chars
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III. Intelligence Information for CVE-2026-42575

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Vendor · 1Advisory · 1Patch · 1

Same Patch Batch · chainguard-dev · 2026-05-09 · 3 CVEs total

CVE-2026-425747.5 HIGHapko dirFS has a symlink-following path traversal that allows multiple entry points to esc
CVE-2026-425766.5 MEDIUMapko `DiscoverKeys` has a panic on non-rsa jwks key that causes crash during key discovery

IV. Related Vulnerabilities

Same product: apko
Same vendor: chainguard-dev
Same weakness: CWE-345

V. Comments for CVE-2026-42575

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