How severe is CVE-2026-25140?

CVE-2026-25140 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-25140 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25140?

CVE-2026-25140 affects Chainguard Apko. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25140?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-25140 have an EU (EUVD) identifier?

Yes. CVE-2026-25140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5381.

When was CVE-2026-25140 published?

CVE-2026-25140 was published on 2026-02-04 and last updated on 2026-06-17.

CVE-2026-25140

CVE-2026-25140 is a high-severity vulnerability in Chainguard Apko with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5381
Weakness: CWE-770
Affected product: Chainguard Apko
Published: 2026-02-04
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-25140?: 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.
How severe is CVE-2026-25140?: CVE-2026-25140 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-25140 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25140?: CVE-2026-25140 affects Chainguard Apko. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25140?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25140 have an EU (EUVD) identifier?: Yes. CVE-2026-25140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5381.
When was CVE-2026-25140 published?: CVE-2026-25140 was published on 2026-02-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:chainguard:apko:*:*:*:*:*:go:*:*

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