High

Io.netty/netty-codec-http: netty: denial of service via unbounded httpservercodec http/1.1 pipeline queue

Type: advisorySource: Official CVE List1 source record

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 grow without limit, leading to unbounded heap memory consumption and a denial of service due to memory exhaustion.

Announced 18 Sept 2026Source revision 1

Original source ↗

CVE-2026-93491

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93491

Red Hat Build of Apache Camel 3.33.3.SP2

Source reference: /containers/cna/affected/0/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Build of Debezium 3.6

Source reference: /containers/cna/affected/1/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat build of Quarkus 3.27.5.SP2

Source reference: /containers/cna/affected/2/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat build of Quarkus 3.33.3.SP2

Source reference: /containers/cna/affected/3/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat AMQ Broker 7

Source reference: /containers/cna/affected/4/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat AMQ Clients

Source reference: /containers/cna/affected/5/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat build of Apache Camel 4 for Quarkus 3

Source reference: /containers/cna/affected/6/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat build of Apache Camel for Spring Boot 4

Source reference: /containers/cna/affected/7/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat build of Apicurio Registry 3

Source reference: /containers/cna/affected/8/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Build of Keycloak

Source reference: /containers/cna/affected/9/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Data Grid 8

Source reference: /containers/cna/affected/10/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Fuse 7

Source reference: /containers/cna/affected/11/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat JBoss Enterprise Application Platform 7

Source reference: /containers/cna/affected/12/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat JBoss Enterprise Application Platform 8

Source reference: /containers/cna/affected/13/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Single Sign-On 7

Source reference: /containers/cna/affected/14/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:/a:redhat:apache_camel_quarkus:3.33"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Build of Apache Camel 3.33.3.SP2",
    "versions": [
      {
        "status": "unaffected",
        "version": "4.1.138.Final-redhat-00001",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "io.netty/netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:debezium:3.6"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Build of Debezium 3.6",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "unaffected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:quarkus:3.27::el8"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat build of Quarkus 3.27.5.SP2",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "defaultStatus": "unaffected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:quarkus:3.33::el8"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat build of Quarkus 3.33.3.SP2",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "defaultStatus": "unaffected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:amq_broker:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat AMQ Broker 7",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:amq_clients:2023"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat AMQ Clients",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:camel_quarkus:3"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat build of Apache Camel 4 for Quarkus 3",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:camel_spring_boot:4"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat build of Apache Camel for Spring Boot 4",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:apicurio_registry:3"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat build of Apicurio Registry 3",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:build_keycloak:"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Build of Keycloak",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jboss_data_grid:8"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Data Grid 8",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jboss_fuse:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Fuse 7",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jboss_enterprise_application_platform:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform 7",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "defaultStatus": "unknown"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jboss_enterprise_application_platform:8"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform 8",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:red_hat_single_sign_on:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Single Sign-On 7",
    "packageName": "netty-codec-http",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  }
]

Related CVEs: CVE-2026-93491
Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event: #29848 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 08:06:08 GMT
Publisher date: Fri, 18 Sep 2026 12:43:26 GMT

Read the original announcement