{"cvss":7.5,"datePublished":"2026-09-18T15:17:20.450","dateUpdated":"2026-11-04T15:17:56.403","description":"A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss.","id":"CVE-2026-93567","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's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss."}],"id":"CVE-2026-93567","lastModified":"2026-11-04T15:17:56.403","metrics":{"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"exploitabilityScore":3.9,"impactScore":3.6,"source":"secalert@redhat.com","type":"Secondary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2026-93567","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-09-21T19:48:36.822411Z","version":"2.0.3"}}]},"published":"2026-09-18T15:17:20.450","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-2026-93567"},{"source":"secalert@redhat.com","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536955"}],"sourceIdentifier":"secalert@redhat.com","vulnStatus":"Awaiting Analysis","weaknesses":[{"description":[{"lang":"en","value":"CWE-20"}],"source":"secalert@redhat.com","type":"Secondary"}]},"severity":"HIGH","source":"nvd","title":"A flaw was found in Netty's HTTP/2 codec"}