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Vulnerability record · CVE-2026-25140 · published 4 February 2026

CVE-2026-25140: Chainguard apko uncontrolled resource consumption vulnerability

Chainguard · Apko

apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before 1.1.1, an attacker who controls or compromises an APK repository used by apko could cause resource exhaustion on the build host. The ExpandApk function in pkg/apk/expandapk/expandapk.go expands .apk streams without enforcing decompression limits, allowing a malicious repository to serve a small, highly-compressed .apk that inflates into a large tar stream, consuming excessive disk space and CPU time, causing build failures or denial of service. This issue has been patched in version 1.1.1.

7.5 CVSS 3.1 High EPSS 0.39% · top 69.6% CWE-400 · Uncontrolled resource consumptionCWE-770 · Allocation without limits
7.5CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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, an attacker who controls or compromises an APK repository used by apko could cause resource exhaustion on the build host. The ExpandApk function in pkg/apk/expandapk/expandapk.go expands .apk streams without enforcing decompression limits, allowing a malicious repository to serve a small, highly-compressed .apk that inflates into a large tar stream, consuming excessive disk space and CPU time, causing build failures or denial of service. This issue has been patched in version 1.1.1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/chainguard-dev/apko/commit/2be3903fe194ad46351840f0569b35f5ac965f09 Patch
https://github.com/chainguard-dev/apko/security/advisories/GHSA-f4w5-5xv9-85f6 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-25140), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.