How severe is CVE-2026-25121?

CVE-2026-25121 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 high, and availability none.

Is CVE-2026-25121 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-2026-25121?

CVE-2026-25121 affects Chainguard Apko. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25121?

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-2026-25121 have an EU (EUVD) identifier?

Yes. CVE-2026-25121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5380.

When was CVE-2026-25121 published?

CVE-2026-25121 was published on 2026-02-04 and last updated on 2026-06-17.

CVE-2026-25121

CVE-2026-25121 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-22.

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-2026-5380
Weakness: CWE-22
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, 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.

Frequently asked questions

What is CVE-2026-25121?: 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.
How severe is CVE-2026-25121?: CVE-2026-25121 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 high, and availability none.
Is CVE-2026-25121 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-2026-25121?: CVE-2026-25121 affects Chainguard Apko. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25121?: 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-2026-25121 have an EU (EUVD) identifier?: Yes. CVE-2026-25121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5380.
When was CVE-2026-25121 published?: CVE-2026-25121 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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CVE-2026-25140 — High (CVSS 7.5): apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before…
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