CVE-2026-104939

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-104939", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "state": "PUBLISHED", "assignerShortName": "f5", "dateReserved": "2026-10-02T17:24:33.310Z", "datePublished": "2026-10-14T14:40:30.052Z", "dateUpdated": "2026-10-15T16:43:46.190Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "modules": ["NIC"], "product": "NGINX Ingress Controller", "vendor": "F5", "versions": [{"lessThan": "5.7.0", "status": "affected", "version": "5.6.0", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "finder", "value": "F5 acknowledges Carl Liljencrantz for bringing this issue to our attention and following the highest standards of coordinated disclosure."}], "datePublic": "2023-01-01T00:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">Description<br><span style=\"background-color: rgb(255, 255, 255);\">NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen.</span>\n\n<br></span><br>Impact<br>This vulnerability may allow remote attackers \n\nunauthenticated\n\n access to protected \n\npaths.&nbsp;There is no control plane exposure; this is a data plane issue only.<br><br>\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "value": "Description\nNGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen.\n\n\n\nImpact\nThis vulnerability may allow remote attackers \n\nunauthenticated\n\n access to protected \n\npaths.\u00a0There is no control plane exposure; this is a data plane issue only.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "impacts": [{"capecId": "CAPEC-115", "descriptions": [{"lang": "en", "value": "CAPEC-115 Authentication Bypass"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.7, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-303", "description": "CWE-303", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "shortName": "f5", "dateUpdated": "2026-10-14T14:40:30.052Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://my.f5.com/manage/s/article/K000162617"}], "source": {"discovery": "EXTERNAL"}, "title": "NGINX Ingress Controller vulnerability", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "None"}], "value": "None"}], "x_generator": {"engine": "F5 SIRTBot v1.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-104939", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-15T15:54:35.366430Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T16:43:46.190Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-104939", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "state": "PUBLISHED", "assignerShortName": "f5", "dateReserved": "2026-10-02T17:24:33.310Z", "datePublished": "2026-10-14T14:40:30.052Z", "dateUpdated": "2026-10-15T16:43:46.190Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "modules": ["NIC"], "product": "NGINX Ingress Controller", "vendor": "F5", "versions": [{"lessThan": "5.7.0", "status": "affected", "version": "5.6.0", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "finder", "value": "F5 acknowledges Carl Liljencrantz for bringing this issue to our attention and following the highest standards of coordinated disclosure."}], "datePublic": "2023-01-01T00:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">Description<br><span style=\"background-color: rgb(255, 255, 255);\">NGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen.</span>\n\n<br></span><br>Impact<br>This vulnerability may allow remote attackers \n\nunauthenticated\n\n access to protected \n\npaths.&nbsp;There is no control plane exposure; this is a data plane issue only.<br><br>\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "value": "Description\nNGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen.\n\n\n\nImpact\nThis vulnerability may allow remote attackers \n\nunauthenticated\n\n access to protected \n\npaths.\u00a0There is no control plane exposure; this is a data plane issue only.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "impacts": [{"capecId": "CAPEC-115", "descriptions": [{"lang": "en", "value": "CAPEC-115 Authentication Bypass"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.7, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-303", "description": "CWE-303", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "shortName": "f5", "dateUpdated": "2026-10-14T14:40:30.052Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://my.f5.com/manage/s/article/K000162617"}], "source": {"discovery": "EXTERNAL"}, "title": "NGINX Ingress Controller vulnerability", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "None"}], "value": "None"}], "x_generator": {"engine": "F5 SIRTBot v1.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-104939", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-15T15:54:35.366430Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T16:38:36.686Z"}}]}}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "modules": ["NIC"], "product": "NGINX Ingress Controller", "vendor": "F5", "versions": [{"lessThan": "5.7.0", "status": "affected", "version": "5.6.0", "versionType": "custom"}]}], "source": "f5sirt@f5.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Description\nNGINX Ingress Controller has a vulnerability when implementing an externalAuth policy for ingress. NGINX Ingress Controller may mishandle the HTTP response from an OAuth IdP and allow an attacker to acquire unauthenticated access to protected paths before the proper external authentication can happen.\n\n\n\nImpact\nThis vulnerability may allow remote attackers \n\nunauthenticated\n\n access to protected \n\npaths.\u00a0There is no control plane exposure; this is a data plane issue only.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "id": "CVE-2026-104939", "lastModified": "2026-10-15T17:17:12.027", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "f5sirt@f5.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "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": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "f5sirt@f5.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-104939", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T15:54:35.366430Z", "version": "2.0.3"}}]}, "published": "2026-10-14T15:17:05.260", "references": [{"source": "f5sirt@f5.com", "url": "https://my.f5.com/manage/s/article/K000162617"}], "sourceIdentifier": "f5sirt@f5.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-303"}], "source": "f5sirt@f5.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.6.0,5.7.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NGINX Ingress Controller", "source": "cna", "vendor": "F5"}, "product": "nginx_ingress_controller", "vendor": "f5"}], "created": "2026-10-15T01:15:10.447241+00:00", "updated": "2026-10-17T04:30:02.686911+00:00", "vendors": ["f5", "f5$PRODUCT$nginx_ingress_controller"]}