What is the CVSS score of CVE-2026-25121?

CVE-2026-25121 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-25121?

Within 24 hours: Identify all systems running Apko versions up to 1.1.1 and assess their role in your container build pipeline. Within 7 days: Apply the available patch to all affected Apko installations and validate patch deployment across development and CI/CD environments. Within 30 days: Conduct a retrospective review of container images built with vulnerable Apko versions and implement image scanning to detect any unauthorized modifications.

Apko CVE-2026-25121

HIGH

Relative Path Traversal (CWE-23)

2026-02-04 security-advisories@github.com

GHSA-5g94-c2wx-8pxw

Path Traversal Golang Apko Suse Chainguard

7.5

CVSS 3.1 · GitHub Advisory

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Supply malicious APK package to apko
Exploit

Craft path traversal payload in package metadata
Execution

MkdirAll/Symlink creates files outside installation root
Impact

Overwrite critical system files

Vulnerability Assessment

Weakness	CWE CWE-23 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V5 - File Handling Relative path traversal prevention
Exploitation Conditions	Attacker must supply malicious APK package to apko build process (via compromised repository, typosquatting, or direct package injection). No authentication or special configuration required—default apko usage with untrusted package sources enables exploitation.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to build and publish OCI container images built from apk packages.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Apko versions up to 1.1.1 contains a vulnerability that allows attackers to build and publish OCI container images built from apk packages (CVSS 7.5).

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 1.1.1.. Validate and sanitize file path inputs. Use allowlists. Restrict network access to the affected service where possible.

Affected Packages

go chainguard.dev/apko fix: 1.1.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

affects 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, 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 th

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 7.5 HIGH

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

SUSE HIGH

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Patch released

Feb 20, 2026 - 21:31 nvd

Patch available

CVE Published

Feb 04, 2026 - 19:16 nvd

HIGH 7.5

DescriptionGitHub Advisory

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.

Executive ViewAI

Why It Matters

Apko versions up to 1.1.1 contain a vulnerability (CVE-2026-25121) that could allow attackers to compromise the integrity of container images used in production environments. Organizations using Apko for OCI image building should prioritize patching to prevent potential supply chain attacks that could affect all downstream container deployments.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.1%

Top 78% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

Affected Products (CPE)GitHub Advisory

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

More in Apko

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CVE-2026-25140 HIGH This Week

7.5 Feb 04

Apko versions 0.14.8 through 1.1.0 are vulnerable to denial of service when processing APK packages from untrusted repos

CVE-2026-25122 MEDIUM This Month

5.5 Feb 04

Resource exhaustion in Apko versions 0.14.8 through 1.0.x allows local attackers to cause denial of service by supplying

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Vendor StatusVendor

SUSE

Severity: High

Product	Status
openSUSE Leap 15.6	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP5	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP6	Fixed
openSUSE Leap 15.5	Fixed

References

Advisories & patches

PATCH https://github.com/chainguard-dev/apko/commit/d8b7887a968a527791b3c591ae83928cb49a9f14 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0403/ REF https://github.com/chainguard-dev/apko/security/advisories/GHSA-5g94-c2wx-8pxw

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GitHub PoC

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