{"cvss":8.2,"datePublished":"2026-09-18T15:17:20.743","dateUpdated":"2026-11-04T15:17:56.813","description":"A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.","id":"CVE-2026-93569","raw":{"affected":[{"affectedData":[{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:apache_camel_quarkus:3.33"],"defaultStatus":"affected","packageName":"io.netty/netty-codec-http2","product":"Red Hat Build of Apache Camel 3.33.3.SP2","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"4.1.138.Final-redhat-00001","versionType":"rpm"}]},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:debezium:3.6"],"defaultStatus":"unaffected","packageName":"netty-codec-http2","product":"Red Hat Build of Debezium 3.6","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","cpes":["cpe:/a:redhat:quarkus:3.27::el8"],"defaultStatus":"unaffected","packageName":"netty-codec-http2","product":"Red Hat build of Quarkus 3.27.5.SP2","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","cpes":["cpe:/a:redhat:quarkus:3.33::el8"],"defaultStatus":"unaffected","packageName":"netty-codec-http2","product":"Red Hat build of Quarkus 3.33.3.SP2","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:jboss_enterprise_application_platform_xp:6.0"],"defaultStatus":"unaffected","packageName":"netty-codec-http2","product":"Red Hat JBoss Enterprise Application Platform 8.1","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:amq_broker:7"],"defaultStatus":"unaffected","packageName":"netty-codec-http2","product":"Red Hat AMQ Broker 7","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:camel_quarkus:3"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat build of Apache Camel 4 for Quarkus 3","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:camel_spring_boot:4"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat build of Apache Camel for Spring Boot 4","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:apicurio_registry:3"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat build of Apicurio Registry 3","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:build_keycloak:"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat Build of Keycloak","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:jboss_data_grid:8"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat Data Grid 8","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:jboss_fuse:7"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat Fuse 7","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:7"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat JBoss Enterprise Application Platform 7","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:8"],"defaultStatus":"unaffected","packageName":"netty-codec-http2","product":"Red Hat JBoss Enterprise Application Platform 8","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","cpes":["cpe:/a:redhat:jbosseapxp"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat JBoss Enterprise Application Platform Expansion Pack","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7"],"defaultStatus":"affected","packageName":"netty-codec-http2","product":"Red Hat Single Sign-On 7","vendor":"Red Hat"}],"source":"secalert@redhat.com"}],"cveTags":[],"descriptions":[{"lang":"en","value":"A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests."}],"id":"CVE-2026-93569","lastModified":"2026-11-04T15:17:56.813","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","version":"3.1"},"exploitabilityScore":3.9,"impactScore":4.2,"source":"secalert@redhat.com","type":"Secondary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2026-93569","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-22T14:36:45.463553Z","version":"2.0.3"}}]},"published":"2026-09-18T15:17:20.743","references":[{"source":"secalert@redhat.com","url":"https://access.redhat.com/errata/RHSA-2026:69440"},{"source":"secalert@redhat.com","url":"https://access.redhat.com/errata/RHSA-2026:69470"},{"source":"secalert@redhat.com","url":"https://access.redhat.com/errata/RHSA-2026:70257"},{"source":"secalert@redhat.com","url":"https://access.redhat.com/errata/RHSA-2026:83612"},{"source":"secalert@redhat.com","url":"https://access.redhat.com/errata/RHSA-2026:95221"},{"source":"secalert@redhat.com","url":"https://access.redhat.com/security/cve/CVE-2026-93569"},{"source":"secalert@redhat.com","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536962"}],"sourceIdentifier":"secalert@redhat.com","vulnStatus":"Awaiting Analysis","weaknesses":[{"description":[{"lang":"en","value":"CWE-444"}],"source":"secalert@redhat.com","type":"Secondary"}]},"severity":"HIGH","source":"nvd","title":"A flaw was found in Netty"}