{"id":"CVE-2026-93491","title":"A flaw was found in Netty's HttpServerCodec","summary":"A flaw was found in Netty's HttpServerCodec. A remote, unauthenticated attacker can exploit this vulnerability by pipelining HTTP/1.1 requests on a single connection and withholding reads. This action causes the methodOverflowQueue to gr…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"Red Hat","product":"netty-codec-http","affected":["netty-codec-http (all versions)","netty-codec-http (all versions)","netty-codec-http (all versions)","netty-codec-http (all versions)","netty-codec-http (all versions)","netty-codec-http (all versions)","netty-codec-http (all versions)","netty-codec-http (all versions)","netty-codec-http","netty-codec-http","netty-codec-http (all versions)","netty-codec-http (all versions)"],"published":"2026-09-18","updated":"2026-09-21","sourceUpdated":"2026-09-21T17:19:17.167","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93491","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:69470","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-93491","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536891","label":"secalert@redhat.com"},{"url":"https://github.com/netty/netty/releases/tag/netty-4.1.138.Final","label":"secalert@redhat.com"},{"url":"https://github.com/netty/netty/releases/tag/netty-4.2.18.Final","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93491.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93491"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93491"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-18T19:06:39.794513Z"},"epss":0.00441,"epssPercentile":0.37638,"ingestedAt":"2026-09-18T13:41:41.659Z","slug":"CVE-2026-93491","body":"## Overview\n\nA flaw was found in Netty's HttpServerCodec. A remote, unauthenticated attacker can exploit this vulnerability by pipelining HTTP/1.1 requests on a single connection and withholding reads. This action causes the methodOverflowQueue to grow without limit, leading to unbounded heap memory consumption and a denial of service due to memory exhaustion.\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 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 Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat Single Sign-On 7, Red Hat AMQ Broker 7, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93491.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}