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

Quick assessment

Affected
chainguard-dev apko
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.5 · High EPSS 0.16% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
chainguard-dev apko < 1.2.7 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
chainguard-dev apko < 1.2.7 -

II. Public POCs for CVE-2026-42575

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7847 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-42575

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Patches & Fixes for CVE-2026-42575 (1)

Vendor Advisories for CVE-2026-42575 (1)

Vendor Pages for CVE-2026-42575 (1)

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

CVE-2026-42574 7.5 HIGH apko dirFS has a symlink-following path traversal that allows multiple entry points to esc
CVE-2026-42576 6.5 MEDIUM apko `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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