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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-56745] Denial of Service via memory exhaustion in SPDY-to-HTTP codec

This high-severity Red Hat Linux advisory covers CVE-2026-56745 affecting Cryostat 4 on RHEL 9, Red Hat AMQ Broker 7.13.6, Red Hat AMQ Broker 7.14.1.

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CVE-2026-56745 Source published Source updated

VulniPulse record published Record updated

CVE-2026-56745
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

Netty is a network application framework for development of protocol servers and clients.

In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the `SpdyHttpDecoder` handler in Netty's SPDY-to-HTTP codec allocates a pooled `ByteBuf` when processing a client-initiated `SYN_STREAM` frame with `FLAG_FIN=0` and stores the partially constructed `FullHttpRequest` in `messageMap`; when the remote peer sends `RST_STREAM` for that stream or the accumulated content exceeds `maxContentLength`, the decoder removes the entry but does not release the pooled `ByteBuf`, causing native memory exhaustion.

This issue is fixed in versions 4.1.136.Final and 4.2.16.Final. A flaw was found in Netty.

This oversight leads to native memory exhaustion, which can result in a Denial of Service (DoS) for the affected system. This is an Important denial of service vulnerability in Netty's SPDY-to-HTTP codec, affecting Red Hat products that utilize vulnerable versions of Netty.

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-772.

Affected products named by the advisory: Cryostat 4 on RHEL 9; Red Hat AMQ Broker 7.13.6; Red Hat AMQ Broker 7.14.1; Red Hat Build of Apache Camel 3.33.2.SP3; and 24 more.

Affected versions
  • 4.2.0
  • 4.2.15
  • 4.1.0
  • 4.1.135

Official advisory · high-confidence parse· fetched 1 day 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
  • datagrid-8/datagrid-8
  • io.netty/netty-codec: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
  • 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 1 day ago·verify at source

Mitigation

Upgrade to a fixed release: 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. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

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