{"id":"CVE-2026-93567","title":"A flaw was found in Netty's HTTP/2 codec","summary":"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 …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-20"],"vendor":"Red Hat","product":"netty-codec-http2","affected":["netty-codec-http2","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)","netty-codec-http2 (all versions)"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T21:17:18.387","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93567","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:69470","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-93567","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536955","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93567.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93567"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93567"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-21T19:48:36.822411Z"},"epss":0.00396,"epssPercentile":0.33558,"ingestedAt":"2026-09-18T14:43:13.068Z","slug":"CVE-2026-93567","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apache Camel for Spring Boot 4, Red Hat build of Apicurio Registry 3, Red Hat build of Debezium 3, Red Hat Build of Keycloak, Red Hat Data Grid 8, … · no fix planned: Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat Single Sign-On 7, Red Hat build of Apache Camel 4 for Quarkus 3, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93567.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}