{"id":"CVE-2026-93573","title":"A flaw was found in Netty's HTTP/1.1 decoder","summary":"A flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-444"],"vendor":"Red Hat","product":"netty-codec-http","affected":["netty-codec-http","netty-codec-http (all versions)","netty-codec-http","netty-codec-http","netty-codec-http","netty-codec-http","netty-codec-http","netty-codec-http","netty-codec-http","netty-codec-http","netty-codec-http","netty-codec-http","netty-codec-http"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T18:17:16.647","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93573","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:69470","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-93573","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536964","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93573.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93573"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93573"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00231,"epssPercentile":0.14185,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-18T16:19:54.114434Z"},"ingestedAt":"2026-09-18T15:44:31.580Z","slug":"CVE-2026-93573","body":"## Overview\n\nA flaw was found in Netty's HTTP/1.1 decoder. This vulnerability allows a remote attacker to bypass `Transfer-Encoding` header validation by splitting the `Transfer-Encoding` field across multiple headers, with the last field containing a non-final transfer coding like `gzip` or `deflate`. This bypass can lead to HTTP request smuggling, enabling attackers to bypass security controls, desynchronize request processing, or cause requests to be processed in an unintended context.\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** · Moderate · affected: Red Hat AMQ Broker 7, Red Hat AMQ Clients, 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, … · no fix planned: Red Hat build of Apicurio Registry 3, Red Hat Build of Keycloak, Red Hat Data Grid 8, Red Hat Fuse 7, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93573.json)","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}