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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-59899] Memory exhaustion in netty-codec-http (decompression bomb)

This high-severity Red Hat Linux advisory covers CVE-2026-59899 affecting Cryostat 4 on RHEL 9, Red Hat AMQ Broker 7.13.6, Red Hat AMQ Broker 7.14.1.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-59899 Source published Source updated

VulniPulse record published Record updated

CVE-2026-59899
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, `HttpContentEncoder` (the superclass of the production handler `HttpContentCompressor`) maintains a per-channel `ArrayDeque` named `acceptEncodingQueue` that accumulates attacker-controlled data without any size limit.

The queue is filled on the I/O thread for every inbound HTTP request and drained only when the application later writes a non-1xx response. This creates a resource exhaustion vulnerability when an attacker exploits HTTP/1.1 pipelining to flood the connection with requests faster than the application produces responses.

A flaw was found in the Netty netty-codec-http component. A remote attacker can send HTTP requests containing highly compressed data.

This can lead to memory exhaustion and a denial of service (DoS), making the service unavailable to legitimate users. This is an Important vulnerability in Netty's HTTP decoder, which could lead to a denial of service.

Red Hat products utilizing `netty-codec-http` are susceptible to memory exhaustion when processing specially crafted, highly compressed HTTP payloads. This allows a remote attacker to trigger excessive memory allocation, impacting system availability.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-409.

Is CVE-2026-59899 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59899 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-59899?

Upgrade to a fixed release named by Red Hat:

  • 4.1.136
  • 4.2.16
  • cryostat/cryostat-reports-rhel9:4.2.0-14
  • cryostat/cryostat-rhel9:4.2.0-14
  • cryostat/jfr-datasource-rhel9:4.2.0-14
  • netty-codec-http
  • io.netty/netty-codec-http:4.1.136.Final-redhat-00001
  • eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el10eap
  • eap8-apache-cxf-0:4.1.7-1.SP1_redhat_00001.1.el10eap
  • eap8-artemis-wildfly-integration-0:2.0.5-1.Final_redhat_00001.1.el10eap
  • eap8-bouncycastle-0:1.85.0-1.redhat_00001.1.el10eap
  • eap8-cryptacular-0:1.2.7-1.redhat_00002.1.el10eap

38 more fixed releases are listed below.

Confirm against the vendor advisory before you patch.

Affected versions
  • < 4.1.136.Final
  • < 4.2.16.Final

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

Fixed versions
  • 4.1.136
  • 4.2.16
  • cryostat/cryostat-reports-rhel9:4.2.0-14
  • cryostat/cryostat-rhel9:4.2.0-14
  • cryostat/jfr-datasource-rhel9:4.2.0-14
  • netty-codec-http
  • io.netty/netty-codec-http:4.1.136.Final-redhat-00001
  • eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el10eap
  • eap8-apache-cxf-0:4.1.7-1.SP1_redhat_00001.1.el10eap
  • eap8-artemis-wildfly-integration-0:2.0.5-1.Final_redhat_00001.1.el10eap
  • eap8-bouncycastle-0:1.85.0-1.redhat_00001.1.el10eap
  • eap8-cryptacular-0:1.2.7-1.redhat_00002.1.el10eap
  • eap8-eap-product-conf-parent-0:801.8.0-1.GA_redhat_00001.1.el10eap
  • eap8-hibernate-0:6.6.54-1.Final_redhat_00001.1.el10eap
  • eap8-httpcomponents-asyncclient-0:4.1.5-5.redhat_00008.1.el10eap
  • eap8-ironjacamar-0:3.0.22-1.Final_redhat_00001.1.el10eap
  • eap8-jackson-annotations-0:2.18.9-1.redhat_00003.1.el10eap
  • eap8-jackson-core-0:2.18.9-1.redhat_00003.1.el10eap
  • eap8-jackson-databind-0:2.18.9-1.redhat_00003.1.el10eap
  • eap8-jackson-dataformats-text-0:2.18.9-1.redhat_00003.1.el10eap
  • eap8-jackson-jaxrs-providers-0:2.18.9-1.redhat_00003.1.el10eap
  • eap8-jackson-modules-base-0:2.18.9-1.redhat_00003.1.el10eap
  • eap8-jackson-modules-java8-0:2.18.9-1.redhat_00003.1.el10eap
  • eap8-jakarta-xml-bind-api-0:4.0.5-1.redhat_00001.1.el10eap
  • eap8-jaxb-0:4.0.7-4.redhat_00001.1.el10eap
  • eap8-jaxbintros-0:2.1.0-1.redhat_00001.1.el10eap
  • eap8-jboss-logging-0:3.6.3-1.Final_redhat_00001.1.el10eap
  • eap8-jboss-remoting-0:5.0.31-1.SP2_redhat_00001.1.el10eap
  • eap8-jbossws-api-0:3.1.0-1.Final_redhat_00001.1.el10eap
  • eap8-jbossws-common-tools-0:2.2.0-1.Final_redhat_00001.1.el10eap
  • eap8-jbossws-cxf-0:7.4.0-1.Final_redhat_00001.1.el10eap
  • eap8-jbossws-jaxws-undertow-httpspi-0:3.0.1-1.Final_redhat_00001.1.el10eap
  • eap8-jbossws-spi-0:5.1.0-1.Final_redhat_00001.1.el10eap
  • eap8-jsf-impl-0:4.0.11-2.SP1_redhat_00001.1.el10eap
  • eap8-log4j-0:2.25.4-1.redhat_00003.1.el10eap
  • eap8-neethi-0:3.2.2-1.redhat_00001.1.el10eap
  • eap8-netty-0:4.1.136-1.Final_redhat_00001.1.el10eap
  • eap8-netty-transport-native-epoll-0:4.1.136-1.Final_redhat_00001.1.el10eap
  • eap8-nimbus-jose-jwt-0:9.37.4-1.redhat_00001.1.el10eap
  • eap8-parsson-0:1.1.9-1.redhat_00001.1.el10eap
  • eap8-saaj-impl-0:3.0.6-1.redhat_00001.1.el10eap
  • eap8-slf4j-0:2.0.18-1.redhat_00001.1.el10eap
  • RHSA-2026:68333
  • RHSA-2026:66545
  • RHSA-2026:66488
  • RHSA-2026:48118
  • RHSA-2026:54622
  • RHSA-2026:76637
  • RHSA-2026:50846
  • RHSA-2026:50848

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

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