esm.sh has path traversal in `extractPackageTarball` that enables file writes from malicious packages_CVE-2026-23644

{
    "lastseen": "",
    "description": "esm.sh is a no-build content delivery network (CDN) for web development. Prior to Go pseeudoversion 0.0.0-20260116051925-c62ab83c589e, the software has a path traversal vulnerability due to an incomplete fix. `path.Clean` normalizes a path but does not prevent absolute paths in a malicious tar file. Commit https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16, corresponding to pseudoversion 0.0.0-20260116051925-c62ab83c589e, fixes this issue.",
    "published": "2026-01-18T22:49:29.676Z",
    "modified": "2026-01-18T22:49:29.676Z",
    "type": "cve",
    "title": "esm.sh has path traversal in `extractPackageTarball` that enables file writes from malicious packages",
    "source": "GitHub_M",
    "references": "https://github.com/esm-dev/esm.sh/security/advisories/GHSA-2657-3c98-63jq\nhttps://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16\nhttps://github.com/esm-dev/esm.sh/commit/c62ab83c589e7b421a0e1376d2a00a4e48161093\nhttps://pkg.go.dev/vuln/GO-2025-4138",
    "id": "CVE-2026-23644",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "esm-dev esm.sh < 0.0.0-20260116051925-c62ab83c589e",
    "sourceHref": "",
    "cvss": {
        "score": 7.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P",
        "version": "4.0"
    },
    "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": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "esm.sh",
    "version": "< 0.0.0-20260116051925-c62ab83c589e",
    "vendor": "esm-dev",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}