CVE-2026-91184

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A namespaced authenticated attacker that configures AuthenticationFilter CRD to an HTTPRoute/GRPCRoute on a shared Gateway can craft a realm value that closes the quoted directive and the enclosing location {} block and injects arbitrary NGINX directives into that Gateway's data-plane config.&nbsp;<br><br>Impact<br><br>A remote authenticated attacker can send crafted requests to configure NGINX Gateway Fabric&nbsp;AuthenticationFilter CRD and&nbsp;may be able to read every co-located tenant's mounted secrets, SSRF via proxy_pass, reading the pod ServiceAccount token, or hijacking other tenants' routes.&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">There is no data plane exposure; this is a control plane issue only.</span>\n\n<br><br>\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "value": "Description\n\nNGINX Gateway Fabric\u00a0has a vulnerability when it renders the spec.basic.realm (and spec.jwt.realm) field of a namespaced AuthenticationFilter verbatim, unescaped and unvalidated, into the shared data-plane nginx.conf as auth_basic \"<realm>\";. A namespaced authenticated attacker that configures AuthenticationFilter CRD to an HTTPRoute/GRPCRoute on a shared Gateway can craft a realm value that closes the quoted directive and the enclosing location {} block and injects arbitrary NGINX directives into that Gateway's data-plane config.\u00a0\n\nImpact\n\nA remote authenticated attacker can send crafted requests to configure NGINX Gateway Fabric\u00a0AuthenticationFilter CRD and\u00a0may be able to read every co-located tenant's mounted secrets, SSRF via proxy_pass, reading the pod ServiceAccount token, or hijacking other tenants' routes.\u00a0There is no data plane exposure; this is a control plane issue only.\n\n\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "impacts": [{"capecId": "CAPEC-3", "descriptions": [{"lang": "en", "value": "CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "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": "LOW", "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:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-76", "description": "CWE-76", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "shortName": "f5", "dateUpdated": "2026-10-14T14:40:27.849Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://my.f5.com/manage/s/article/K000162609"}], "source": {"discovery": "EXTERNAL"}, "title": "NGINX Gateway Fabric vulnerability", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">\n\n<div><p>As this attack is conducted by authenticated users with Kubernetes Role-based Access Control (RBAC) write access to AuthenticationFilter&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">CRD</span>&nbsp;and Secrets, the only complete mitigation is to restrict that access to fully trusted administrators only.</p></div></span>"}], "value": "As this attack is conducted by authenticated users with Kubernetes Role-based Access Control (RBAC) write access to AuthenticationFilter\u00a0CRD\u00a0and Secrets, the only complete mitigation is to restrict that access to fully trusted administrators only."}], "x_generator": {"engine": "F5 SIRTBot v1.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-91184", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T03:57:02.149250Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T10:31:15.425Z"}}]}}

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A namespaced authenticated attacker that configures AuthenticationFilter CRD to an HTTPRoute/GRPCRoute on a shared Gateway can craft a realm value that closes the quoted directive and the enclosing location {} block and injects arbitrary NGINX directives into that Gateway's data-plane config.\u00a0\n\nImpact\n\nA remote authenticated attacker can send crafted requests to configure NGINX Gateway Fabric\u00a0AuthenticationFilter CRD and\u00a0may be able to read every co-located tenant's mounted secrets, SSRF via proxy_pass, reading the pod ServiceAccount token, or hijacking other tenants' routes.\u00a0There is no data plane exposure; this is a control plane issue only.\n\n\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "supportingMedia": [{"type": "text/html", "value": "Description<br><br>NGINX Gateway Fabric&nbsp;has a vulnerability when it renders the spec.basic.realm (and spec.jwt.realm) field of a namespaced AuthenticationFilter verbatim, unescaped and unvalidated, into the shared data-plane nginx.conf as auth_basic \"&lt;realm&gt;\";. A namespaced authenticated attacker that configures AuthenticationFilter CRD to an HTTPRoute/GRPCRoute on a shared Gateway can craft a realm value that closes the quoted directive and the enclosing location {} block and injects arbitrary NGINX directives into that Gateway's data-plane config.&nbsp;<br><br>Impact<br><br>A remote authenticated attacker can send crafted requests to configure NGINX Gateway Fabric&nbsp;AuthenticationFilter CRD and&nbsp;may be able to read every co-located tenant's mounted secrets, SSRF via proxy_pass, reading the pod ServiceAccount token, or hijacking other tenants' routes.&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">There is no data plane exposure; this is a control plane issue only.</span>\n\n<br><br>\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-76", "description": "CWE-76"}]}], "providerMetadata": {"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "shortName": "f5", "dateUpdated": "2026-10-14T14:40:27.849Z"}}}, "cveMetadata": {"cveId": "CVE-2026-91184", "state": "PUBLISHED", "dateUpdated": "2026-10-15T10:31:15.425Z", "dateReserved": "2026-09-30T21:56:14.612Z", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "datePublished": "2026-10-14T14:40:27.849Z", "assignerShortName": "f5"}, "dataVersion": "5.2"}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.4.0,2.8.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NGINX Gateway Fabric", "source": "cna", "vendor": "F5"}, "product": "nginx_gateway_fabric", "vendor": "f5"}], "created": "2026-10-15T02:00:12.671282+00:00", "updated": "2026-10-22T22:00:14.356680+00:00", "vendors": ["f5", "f5$PRODUCT$nginx_gateway_fabric"]}