esm.sh writes arbitrary files via path traversal in `X-Zone-Id` header_CVE-2025-59342

{
    "lastseen": "",
    "description": "esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a filesystem path but is not properly canonicalized or restricted to the application\u2019s storage base directory. As a result, supplying ../ sequences in X-Zone-Id causes files to be written to arbitrary directories.",
    "published": "2025-09-17T17:59:34.163Z",
    "modified": "2025-09-17T17:59:34.163Z",
    "type": "cve",
    "title": "esm.sh writes arbitrary files via path traversal in `X-Zone-Id` header",
    "source": "GitHub_M",
    "references": "https://github.com/esm-dev/esm.sh/security/advisories/GHSA-g2h5-cvvr-7gmw\nhttps://github.com/esm-dev/esm.sh/blob/main/server/router.go#L116\nhttps://github.com/esm-dev/esm.sh/blob/main/server/router.go#L411",
    "id": "CVE-2025-59342",
    "bulletinFamily": "",
    "cwe": [
        "CWE-24"
    ],
    "cvelist": null,
    "sourceData": "esm-dev esm.sh <= 136",
    "sourceHref": "",
    "cvss": {
        "score": 5.5,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "esm.sh",
    "version": "<= 136",
    "vendor": "esm-dev",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}