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Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtpresponsedecoder leads to memory-exhaustion dos

Type: advisorySource: Official CVE List1 source record

A flaw was found in Netty's `SmtpResponseDecoder` component. A remote attacker, acting as a malicious or man-in-the-middle (MITM) SMTP server, could exploit this by sending a specially crafted, unbounded multi-line SMTP response without a terminator. This vulnerability leads to unbounded memory accumulation within the client's Java Virtual Machine (JVM) heap, causing an `OutOfMemoryError` and a denial of service (DoS) due to a process crash.

Announced Group revision 1
Original source ↗

CVE-2026-93563

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-2026-93563

Red Hat build of Apache Camel for Spring Boot 4

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

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Red Hat Fuse 7

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

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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/2/product

Affected versions
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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/3/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/4/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/5/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/6/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:camel_spring_boot:4"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat build of Apache Camel for Spring Boot 4",
    "packageName": "netty-codec-smtp",
    "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-smtp",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "unaffected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jboss_enterprise_application_platform:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform 7",
    "packageName": "jboss-eap-7/eap74-els-openjdk11-openshift-rhel8",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jboss_enterprise_application_platform:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform 7",
    "packageName": "jboss-eap-7/eap74-els-openjdk17-openshift-rhel8",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jboss_enterprise_application_platform:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform 7",
    "packageName": "jboss-eap-7/eap74-els-openjdk8-openshift-rhel8",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:jboss_enterprise_application_platform:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform 7",
    "packageName": "netty-codec-smtp",
    "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-smtp",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93563

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#2000 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-93563 · Revision 1Source updated