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Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can resul…","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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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","score":7.8,"severity":null}],"references":["https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37","https://github.com/dadrus/heimdall/pull/3208","https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943","https://github.com/dadrus/heimdall/releases/tag/v0.17.14"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28509","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 8, 2026, 3:42:50 AM","dateUpdated":"May 8, 2026, 10:40:56 AM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-42273","identifiers":["CVE-2026-42273"]},"retained":false,"historicalAffected":[]},{"revision":"b8d4b9a5e32647e19ae35e990b6ba4db","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-72h4-mxfc-jx37","aliases":["CVE-2026-42273","GO-2026-5200"],"title":"Heimdall: Case-sensitive host matching may lead to policy bypass","description":"### Summary\n\nHeimdall 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.\n\n**Note:** The issue can only lead to unintended access if heimdall is configured with an \"allow all\" default rule. Since v0.16.0, heimdall enforces secure defaults and refuses to start with such a configuration unless this enforcement is explicitly disabled, e.g. via `--insecure-skip-secure-default-rule-enforcement` or the broader `--insecure` flag.\n\n### Details\n\nThis vulnerability can potentially be exploited by an adversary if rule matching relies on the request host.\n\nFor example, consider the following rule:\n\n```yaml\nid: rule-1\nmatch:\n  hosts:\n    - type: exact\n      value: admin.example.com\nexecute: # configured to require authentication and authorization\n  # ...\n```\n\nIf an adversary now sends a request with the `Host` header set to `Admin.Example.Com`, rule-1 will not be matched, and the following will happen instead:\n\n* If no default rule is configured, the request will result in an error (`404 Not Found`)\n* If a default rule is configured, it will be executed. If the default rule is configured in an overly permissive way (e.g. allowing anonymous access), this results in a policy bypass.\n\n### Impact\n\nBypass of access control policies enforced by heimdall may lead to the following consequences:\n\n* Access to or modification of data that should be restricted\n* Invocation of functionality that is expected to require authentication or authorization\n* In certain configurations, escalation of privileges depending on the exposed functionality\n\n### Workarounds\n\n* Normalize request hosts to lowercase in the layers in front of heimdall.\n* Do not configure a permissive default rule. Respectively, do not make use of the `--insecure` or the `--insecure-skip-secure-default-rule-enforcement` flags.\n* When using `regex` type for host matching, expressions shall be defined in a case-insensitive manner (e.g. `(?i)^admin\\.example\\.com$`)\n* Include the ID of the rule expected to be executed in the JWT issued by heimdall and check that value in the consuming project's service.","state":0,"publishedAt":"2026-04-25T23:30:18+00:00","modifiedAt":"2026-06-25T19:56:09.4005227+00:00","affected":[{"ecosystem":"Go","name":"github.com/dadrus/heimdall","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.17.14"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37","https://nvd.nist.gov/vuln/detail/CVE-2026-42273","https://github.com/dadrus/heimdall/pull/3208","https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943","https://github.com/dadrus/heimdall","https://github.com/dadrus/heimdall/releases/tag/v0.17.14"],"sourceUrl":"https://github.com/advisories/GHSA-72h4-mxfc-jx37","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-72h4-mxfc-jx37","identifiers":["GHSA-72h4-mxfc-jx37","CVE-2026-42273","GO-2026-5200"]},"retained":false,"historicalAffected":[]},{"revision":"1879421dc4484b7395041638a5fc8183","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5200","aliases":["CVE-2026-42273","GHSA-72h4-mxfc-jx37"],"title":"Heimdall: Case-sensitive host matching may lead to policy bypass in github.com/dadrus/heimdall","description":"Heimdall: Case-sensitive host matching may lead to policy bypass in github.com/dadrus/heimdall","state":0,"publishedAt":"2026-06-25T18:43:15+00:00","modifiedAt":"2026-06-25T19:45:13.9171711+00:00","affected":[{"ecosystem":"Go","name":"github.com/dadrus/heimdall","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.17.14"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37","https://nvd.nist.gov/vuln/detail/CVE-2026-42273","https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943","https://github.com/dadrus/heimdall/pull/3208","https://github.com/dadrus/heimdall/releases/tag/v0.17.14"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5200","license":"OSV · upstream source license applies","key":"osv:GO-2026-5200","identifiers":["GO-2026-5200","CVE-2026-42273","GHSA-72h4-mxfc-jx37"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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