Nitro: Proxy scope bypass via percent-encoded path traversal in `routeRules`_CVE-2026-44373

{
    "lastseen": "",
    "description": "Nitro is a next generation server toolkit. Prior to 3.0.260429-beta, an attacker could bypass a proxy route rule by sending percent-encoded path traversal (..%2f) in the URL, causing Nitro to forward a request that the upstream resolved outside the configured scope. This vulnerability is fixed in 3.0.260429-beta.",
    "published": "2026-05-13T20:26:28.255Z",
    "modified": "2026-05-13T20:26:28.255Z",
    "type": "cve",
    "title": "Nitro: Proxy scope bypass via percent-encoded path traversal in `routeRules`",
    "source": "GitHub_M",
    "references": "https://github.com/nitrojs/nitro/security/advisories/GHSA-5w89-w975-hf9q\nhttps://github.com/nitrojs/nitro/pull/4222\nhttps://github.com/nitrojs/nitro/pull/4223\nhttps://github.com/nitrojs/nitro/releases/tag/v2.13.4\nhttps://github.com/nitrojs/nitro/releases/tag/v3.0.260429-beta",
    "id": "CVE-2026-44373",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "nitrojs nitro < 3.0.260429-beta\nnitrojs nitropack < 2.13.4",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "nitro",
    "version": "< 3.0.260429-beta",
    "vendor": "nitrojs",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}