{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.17.14"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3d05e56a9e7ef0355f17482b4322054af4e85943"
            },
            {
              "fixed": "c89e65c0d7cc0c2456c067836614ab9190771088"
            }
          ],
          "repo": "https://github.com/dadrus/heimdall",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-72h4-mxfc-jx37"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-178",
      "CWE-436"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42273.json"
  },
  "details": "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.",
  "id": "CVE-2026-42273",
  "modified": "2026-08-07T11:31:11.317955669Z",
  "published": "2026-05-08T03:42:50.312Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42273.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42273"
    },
    {
      "type": "FIX",
      "url": "https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943"
    },
    {
      "type": "FIX",
      "url": "https://github.com/dadrus/heimdall/pull/3208"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Heimdall: Case-sensitive host matching may lead to policy bypass"
}