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Io.netty/netty-codec-http2: netty: http/2 hpackencoder dos with large table size

Type: advisorySource: Official CVE List1 source record

A flaw was found in Netty's HTTP/2 HpackEncoder. A remote attacker can exploit this by sending HTTP/2 SETTINGS frames with a very large MAX_HEADER_TABLE_SIZE. This causes the HpackEncoder to store an excessive number of unique headers, leading to increased CPU usage and memory consumption, ultimately resulting in a Denial of Service (DoS).

Announced Group revision 1
Original source ↗

CVE-2026-93492

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-2026-93492

Red Hat Build of Debezium 3.6

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

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Not stated in this record
Fixed versions
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Prerequisites
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Red Hat build of Quarkus 3.27.5.SP2

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

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Fixed versions
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Prerequisites
Not stated in this record

Red Hat build of Quarkus 3.33.3.SP2

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

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Prerequisites
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Red Hat AMQ Broker 7

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

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Fixed versions
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Prerequisites
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Red Hat build of Apache Camel 4 for Quarkus 3

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

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Fixed versions
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Prerequisites
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Red Hat build of Apache Camel for Spring Boot 4

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

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Prerequisites
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Red Hat build of Apicurio Registry 3

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

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Red Hat Build of Keycloak

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

Affected versions
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Fixed versions
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Prerequisites
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Red Hat Data Grid 8

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

Affected versions
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Prerequisites
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Red Hat Fuse 7

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

Affected versions
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Fixed versions
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Prerequisites
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Red Hat JBoss Enterprise Application Platform 7

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

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Red Hat JBoss Enterprise Application Platform 8

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

Affected versions
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Fixed versions
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Prerequisites
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Red Hat JBoss Enterprise Application Platform Expansion Pack

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

Affected versions
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Fixed versions
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Prerequisites
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Red Hat Single Sign-On 7

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

Affected versions
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Fixed versions
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Prerequisites
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Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:/a:redhat:debezium:3.6"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Build of Debezium 3.6",
    "packageName": "netty-codec-http2",
    "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-http2",
    "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-http2",
    "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-http2",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "unaffected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:camel_quarkus:3"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat build of Apache Camel 4 for Quarkus 3",
    "packageName": "netty-codec-http2",
    "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-http2",
    "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-http2",
    "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-http2",
    "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-http2",
    "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-http2",
    "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-http2",
    "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-http2",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "defaultStatus": "unaffected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jbosseapxp"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "packageName": "netty-codec-http2",
    "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-http2",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "unknown"
  }
]
Related CVEs
CVE-2026-93492

Source reference: /cveMetadata/cveId

Publisher severity

medium

Source reference: /containers/cna/metrics

Event
#32878 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-93492 · Revision 1Source updated