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CVE-2026-25121— apko is vulnerable to path traversal in apko dirFS which allows filesystem writes outside base

Quick assessment

Affected
chainguard-dev apko
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 0.14.8版本至1.1.1之前版本存在安全漏洞，该漏洞源于dirFS文件系统抽象层存在路径遍历漏洞，可能导致在预期安装根目录外创建目录或符号链接。

CVSS 7.5 · High EPSS 0.42% · P35
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I. Basic Information for CVE-2026-25121

Vulnerability Information
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Vulnerability Title
apko is vulnerable to path traversal in apko dirFS which allows filesystem writes outside base
Source: CVE Program / CVE List V5
Vulnerability Description
apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before 1.1.1, a path traversal vulnerability was discovered in apko's dirFS filesystem abstraction. An attacker who can supply a malicious APK package (e.g., via a compromised or typosquatted repository) could create directories or symlinks outside the intended installation root. The MkdirAll, Mkdir, and Symlink methods in pkg/apk/fs/rwosfs.go use filepath.Join() without validating that the resulting path stays within the base directory. This issue has been patched in version 1.1.1.
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
相对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
apko 安全漏洞
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1.1.1之前版本存在安全漏洞，该漏洞源于dirFS文件系统抽象层存在路径遍历漏洞，可能导致在预期安装根目录外创建目录或符号链接。
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 >= 0.14.8, < 1.1.1 -

II. Public POCs for CVE-2026-25121

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III. Intelligence Information for CVE-2026-25121

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Same Patch Batch · chainguard-dev · 2026-02-04 · 7 CVEs total

CVE-2026-24843 8.2 HIGH melange QEMU runner could write files outside workspace directory
CVE-2026-25143 7.8 HIGH melange affected by potential host command execution via license-check YAML mode patch pip
CVE-2026-24844 7.8 HIGH melange pipeline working-directory could allow command injection
CVE-2026-25140 7.5 HIGH apko affected by potential unbounded resource consumption in expandapk.ExpandApk on attack
CVE-2026-25122 5.5 MEDIUM apko is vulnerable to unbounded resource consumption in expandapk.Split on attacker-contro
CVE-2026-25145 5.5 MEDIUM melange has a path traversal in license-path which allows reading files outside workspace

IV. Related Vulnerabilities

Same product: apko
Same vendor: chainguard-dev
Same weakness: CWE-23

V. Comments for CVE-2026-25121

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