CVE-2026-42273

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42273", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-26T11:53:27.707Z", "datePublished": "2026-05-08T03:42:50.312Z", "dateUpdated": "2026-05-08T10:40:56.541Z"}, "containers": {"cna": {"title": "Heimdall: Case-sensitive host matching may lead to policy bypass", "problemTypes": [{"descriptions": [{"cweId": "CWE-436", "lang": "en", "description": "CWE-436: Interpretation Conflict", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-178", "lang": "en", "description": "CWE-178: Improper Handling of Case Sensitivity", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "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"}}], "references": [{"name": "https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37"}, {"name": "https://github.com/dadrus/heimdall/pull/3208", "tags": ["x_refsource_MISC"], "url": "https://github.com/dadrus/heimdall/pull/3208"}, {"name": "https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943", "tags": ["x_refsource_MISC"], "url": "https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943"}, {"name": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14", "tags": ["x_refsource_MISC"], "url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14"}], "affected": [{"vendor": "dadrus", "product": "heimdall", "versions": [{"version": "< 0.17.14", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-08T03:42:50.312Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-72h4-mxfc-jx37", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-08T10:40:38.505776Z", "id": "CVE-2026-42273", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-08T10:40:56.541Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-42273", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-08T10:40:38.505776Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-08T10:40:48.995Z"}}], "cna": {"title": "Heimdall: Case-sensitive host matching may lead to policy bypass", "source": {"advisory": "GHSA-72h4-mxfc-jx37", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 7.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "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", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "NONE"}}], "affected": [{"vendor": "dadrus", "product": "heimdall", "versions": [{"status": "affected", "version": "< 0.17.14"}]}], "references": [{"url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37", "name": "https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/dadrus/heimdall/pull/3208", "name": "https://github.com/dadrus/heimdall/pull/3208", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943", "name": "https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14", "name": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-436", "description": "CWE-436: Interpretation Conflict"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-178", "description": "CWE-178: Improper Handling of Case Sensitivity"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-08T03:42:50.312Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42273", "state": "PUBLISHED", "dateUpdated": "2026-05-08T10:40:56.541Z", "dateReserved": "2026-04-26T11:53:27.707Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-05-08T03:42:50.312Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "heimdall", "vendor": "dadrus", "versions": [{"status": "affected", "version": "< 0.17.14"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Heimdall es un servicio de Proxy Consciente de Identidad y de Decisi\u00f3n de Control de Acceso nativo de la nube. Antes de la versi\u00f3n 0.17.14, Heimdall realiza la coincidencia de hosts de manera sensible a may\u00fasculas y min\u00fasculas, mientras que los nombres de host HTTP no distinguen entre may\u00fasculas y min\u00fasculas. Esta discrepancia puede hacer que Heimdall no logre hacer coincidir una regla para un host de solicitud que difiere solo en el uso de may\u00fasculas y min\u00fasculas, lo que podr\u00eda causar que la solicitud se clasifique de manera diferente a lo previsto. Este problema ha sido parcheado en la versi\u00f3n 0.17.14."}], "id": "CVE-2026-42273", "lastModified": "2026-10-26T20:10:00.160", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42273", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-08T10:40:38.505776Z", "version": "2.0.3"}}]}, "published": "2026-05-08T04:16:22.457", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943"}, {"source": "security-advisories@github.com", "url": "https://github.com/dadrus/heimdall/pull/3208"}, {"source": "security-advisories@github.com", "url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14"}, {"source": "security-advisories@github.com", "url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-178"}, {"lang": "en", "value": "CWE-436"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.17.14)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "heimdall", "source": "cna", "vendor": "dadrus"}, "product": "heimdall", "vendor": "dadrus"}], "created": "2026-05-08T05:30:45.936758+00:00", "updated": "2026-05-08T05:30:46.219391+00:00", "vendors": ["dadrus", "dadrus$PRODUCT$heimdall"]}