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CVE-2026-25122— apko is vulnerable to unbounded resource consumption in expandapk.Split on attacker-controlled .apk streams

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1.1.0之前版本存在资源管理错误漏洞，该漏洞源于expandapk.Split函数处理APK归档时未设置明确边界，可能导致资源耗尽。

CVSS 5.5 · Medium EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-25122

Vulnerability Information
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Vulnerability Title
apko is vulnerable to unbounded resource consumption in expandapk.Split on attacker-controlled .apk streams
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 1.1.0, expandapk.Split drains the first gzip stream of an APK archive via io.Copy(io.Discard, gzi) without explicit bounds. With an attacker-controlled input stream, this can force large gzip inflation work and lead to resource exhaustion (availability impact). The Split function reads the first tar header, then drains the remainder of the gzip stream by reading from the gzip reader directly without any maximum uncompressed byte limit or inflate-ratio cap. A caller that parses attacker-controlled APK streams may be forced to spend excessive CPU time inflating gzip data, leading to timeouts or process slowdown. This issue has been patched in version 1.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
apko 资源管理错误漏洞
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1.1.0之前版本存在资源管理错误漏洞，该漏洞源于expandapk.Split函数处理APK归档时未设置明确边界，可能导致资源耗尽。
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, < 1.1.0 -

II. Public POCs for CVE-2026-25122

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III. Intelligence Information for CVE-2026-25122

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Patches & Fixes for CVE-2026-25122 (1)

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-2026-25121 7.5 HIGH apko is vulnerable to path traversal in apko dirFS which allows filesystem writes outside
CVE-2026-25140 7.5 HIGH apko affected by potential unbounded resource consumption in expandapk.ExpandApk on attack
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-400

V. Comments for CVE-2026-25122

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