apko is vulnerable to path traversal in apko dirFS which allows filesystem writes outside base_CVE-2026-25121

{
    "lastseen": "",
    "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.",
    "published": "2026-02-04T19:02:17.979Z",
    "modified": "2026-02-04T19:18:52.495Z",
    "type": "cve",
    "title": "apko is vulnerable to path traversal in apko dirFS which allows filesystem writes outside base",
    "source": "GitHub_M",
    "references": "https://github.com/chainguard-dev/apko/security/advisories/GHSA-5g94-c2wx-8pxw\nhttps://github.com/chainguard-dev/apko/commit/d8b7887a968a527791b3c591ae83928cb49a9f14",
    "id": "CVE-2026-25121",
    "bulletinFamily": "",
    "cwe": [
        "CWE-23"
    ],
    "cvelist": null,
    "sourceData": "chainguard-dev apko >= 0.14.8, < 1.1.1",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
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            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "apko",
    "version": ">= 0.14.8, < 1.1.1",
    "vendor": "chainguard-dev",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}