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CVE-2026-42574— apko dirFS has a symlink-following path traversal that allows multiple entry points to escape the build root

CVSS 7.5 · High EPSS 0.05% · P16
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I. Basic Information for CVE-2026-42574

Vulnerability Information
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Vulnerability Title
apko dirFS has a symlink-following path traversal that allows multiple entry points to escape the build root
Source: NVD (National Vulnerability Database)
Vulnerability Description
apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before version 1.2.5, a crafted .apk could install a TypeSymlink tar entry whose target pointed outside the build root, and a subsequent directory-creation or file-write entry in the same or later archive could traverse that symlink to reach host paths the build user could write to. This issue has been patched in version 1.2.5.
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
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
apko 路径遍历漏洞
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 0.14.8版本至1.2.5之前版本存在路径遍历漏洞，该漏洞源于特制.apk包可能安装指向构建根目录外的TypeSymlink tar条目，可能导致后续操作遍历符号链接访问主机路径。
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 >= 0.14.8, < 1.2.5 -

II. Public POCs for CVE-2026-42574

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7176 chars
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III. Intelligence Information for CVE-2026-42574

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

CVE-2026-425757.5 HIGHapko doesn't verify downloaded apk packages against APKINDEX checksum (package substitutio
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-22

V. Comments for CVE-2026-42574

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