chainguard-dev apko up to 1.1.0 expandapk.go ExpandApk resource consumption

Summaryinfo

A vulnerability has been found in chainguard-dev apko up to 1.1.0 and classified as problematic. This issue affects the function ExpandApk of the file pkg/apk/expandapk/expandapk.go. Performing a manipulation results in resource consumption. This vulnerability was named CVE-2026-25140. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in chainguard-dev apko up to 1.1.0. This affects the function ExpandApk of the file pkg/apk/expandapk/expandapk.go. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-25140 since 01/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 1.1.1 eliminates this vulnerability. Applying the patch 2be3903fe194ad46351840f0569b35f5ac965f09 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• chainguard-dev

Name

• apko

Version

• 1.0
• 1.1.0

License

• open-source

Website

• Product: https://github.com/chainguard-dev/apko/

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion