Heimdall: Case-sensitive host matching may lead to policy bypass_CVE-2026-42273

{
    "lastseen": "",
    "description": "Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host that differs only in letter casing, potentially causing the request to be classified differently than intended. This issue has been patched in version 0.17.14.",
    "published": "2026-05-08T03:42:50.312Z",
    "modified": "2026-05-08T03:42:50.312Z",
    "type": "cve",
    "title": "Heimdall: Case-sensitive host matching may lead to policy bypass",
    "source": "GitHub_M",
    "references": "https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37\nhttps://github.com/dadrus/heimdall/pull/3208\nhttps://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943\nhttps://github.com/dadrus/heimdall/releases/tag/v0.17.14",
    "id": "CVE-2026-42273",
    "bulletinFamily": "",
    "cwe": [
        "CWE-436",
        "CWE-178"
    ],
    "cvelist": null,
    "sourceData": "dadrus heimdall < 0.17.14",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
        "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": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "heimdall",
    "version": "< 0.17.14",
    "vendor": "dadrus",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}