--- id: CVE-2026-56745 title: >- netty: io.netty/netty-codec-http: Netty: Denial of Service via memory exhaustion in SPDY-to-HTTP codec (CVE-2026-56745) summary: >- A flaw was found in Netty. A remote attacker can exploit a vulnerability in the `SpdyHttpDecoder` handler of Netty's SPDY-to-HTTP codec. When processing a client-initiated `SYN_STREAM` frame, the decoder fails to release allocated memory i… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cvssSource: vendor cwe: - CWE-772 - CWE-400 vendor: Red Hat product: Red Hat JBoss EAP 8.1 for RHEL 8 affected: - openshift_serverless - amq_clients - build_of_apache_camel_hawtio 4 - build_of_apache_camel_4_for_quarkus 3 - build_of_apicurio_registry 3 - build_of_debezium 3 - build_of_keycloak - data_grid 8 - enterprise_linux_ai_rhel_ai 3 - jboss_enterprise_application_platform 7 - openshift_dev_spaces - single_sign_on 7 - streams_for_apache_kafka 2 - jboss_eap_8_1_for_rhel 10 - jboss_eap_8_1_for_rhel 8 - cryostat_4_on_rhel 9 - jboss_eap_8_1_for_rhel 9 - amq_broker 7.13.6 - amq_broker 7.14.1 - build_of_apache_camel_4_18_for_quarkus 3.33 - data_grid 8.6.3 - openshift_ai 2.25 - openshift_dev_spaces 3.30 - build_of_apache_camel_4_18_3_for_spring_boot 3.5.16 - build_of_quarkus 3.27.4.SP3 - build_of_quarkus 3.33.2.SP3 - streams_for_apache_kafka 3.2.1 patched: - jboss_eap_8_1_for_rhel 10 - jboss_eap_8_1_for_rhel 8 - cryostat_4_on_rhel 9 - jboss_eap_8_1_for_rhel 9 - amq_broker 7.13.6 - amq_broker 7.14.1 - build_of_apache_camel_4_18_for_quarkus 3.33 - data_grid 8.6.3 - openshift_ai 2.25 - openshift_dev_spaces 3.30 - build_of_apache_camel_4_18_3_for_spring_boot 3.5.16 - build_of_quarkus 3.27.4.SP3 - build_of_quarkus 3.33.2.SP3 - streams_for_apache_kafka 3.2.1 published: '2026-07-21' updated: '2026-09-22' sourceUpdated: '2026-09-22T15:40:15+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56745.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56745.json - url: 'https://access.redhat.com/security/cve/CVE-2026-56745' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2505911' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-56745' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56745' - url: >- https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b - url: >- https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 - url: 'https://github.com/netty/netty/releases/tag/netty-4.1.136.Final' - url: 'https://github.com/netty/netty/releases/tag/netty-4.2.16.Final' - url: 'https://github.com/netty/netty/security/advisories/GHSA-jppx-w49h-x2qq' - url: 'https://access.redhat.com/errata/RHSA-2026:70230' - url: 'https://access.redhat.com/errata/RHSA-2026:70228' - url: 'https://access.redhat.com/errata/RHSA-2026:68333' - url: 'https://access.redhat.com/errata/RHSA-2026:70229' - url: 'https://access.redhat.com/errata/RHSA-2026:66545' - url: 'https://access.redhat.com/errata/RHSA-2026:66488' - url: 'https://access.redhat.com/errata/RHSA-2026:48118' - url: 'https://access.redhat.com/errata/RHSA-2026:69296' - url: 'https://access.redhat.com/errata/RHSA-2026:65126' - url: 'https://access.redhat.com/errata/RHSA-2026:62260' - url: 'https://access.redhat.com/errata/RHSA-2026:68754' - url: 'https://access.redhat.com/errata/RHSA-2026:54622' - url: 'https://access.redhat.com/errata/RHSA-2026:47189' - url: 'https://access.redhat.com/errata/RHSA-2026:47172' - url: 'https://access.redhat.com/errata/RHSA-2026:54435' - url: 'https://github.com/advisories/GHSA-jppx-w49h-x2qq' tags: - csaf - vex - red-hat - ghsa - maven epss: 0.00612 epssPercentile: 0.47976 aliases: - GHSA-jppx-w49h-x2qq ecosystem: maven ingestedAt: '2026-07-22T22:06:57.946Z' --- ## Overview A flaw was found in Netty. A remote attacker can exploit a vulnerability in the `SpdyHttpDecoder` handler of Netty's SPDY-to-HTTP codec. When processing a client-initiated `SYN_STREAM` frame, the decoder fails to release allocated memory if the stream is reset or content limits are exceeded. This oversight leads to native memory exhaustion, which can result in a Denial of Service (DoS) for the affected system. ## Vendor advisories - **RHSA-2026:70230** · Red Hat · fixed in: Red Hat JBoss EAP 8.1 for RHEL 10 · released 2026-09-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:70230) - **RHSA-2026:70228** · Red Hat · fixed in: Red Hat JBoss EAP 8.1 for RHEL 8 · released 2026-09-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:70228) - **RHSA-2026:68333** · Red Hat · fixed in: Cryostat 4 on RHEL 9 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68333) - **RHSA-2026:70229** · Red Hat · fixed in: Red Hat JBoss EAP 8.1 for RHEL 9 · released 2026-09-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:70229) - **RHSA-2026:66545** · Red Hat · fixed in: Red Hat AMQ Broker 7.13.6 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66545) - **RHSA-2026:66488** · Red Hat · fixed in: Red Hat AMQ Broker 7.14.1 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66488) - **RHSA-2026:48118** · Red Hat · fixed in: Red Hat Build of Apache Camel 4.18 for Quarkus 3.33 · released 2026-07-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:48118) - **RHSA-2026:69296** · Red Hat · fixed in: Red Hat Data Grid 8.6.3 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69296) - **RHSA-2026:65126** · Red Hat · fixed in: Red Hat OpenShift AI 2.25 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65126) - **RHSA-2026:62260** · Red Hat · fixed in: Red Hat OpenShift Dev Spaces 3.30 · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:62260) - **RHSA-2026:68754** · Red Hat · fixed in: Red Hat OpenShift Dev Spaces 3.30 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68754) - **Red Hat VEX** · Important · affected: OpenShift Serverless, Red Hat AMQ Clients, Red Hat build of Apache Camel - HawtIO 4, Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apicurio Registry 3, Red Hat build of Debezium 3, … · no fix planned: Red Hat build of Debezium 3, Red Hat JBoss Enterprise Application Platform 7, OpenShift Serverless, Red Hat AMQ Clients, … · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56745.json) - **RHSA-2026:54622** · Red Hat · fixed in: Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16 · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54622) - **RHSA-2026:47189** · Red Hat · fixed in: Red Hat build of Quarkus 3.27.4.SP3 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47189) - **RHSA-2026:47172** · Red Hat · fixed in: Red Hat build of Quarkus 3.33.2.SP3 · released 2026-07-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:47172) - **RHSA-2026:54435** · Red Hat · fixed in: Streams for Apache Kafka 3.2.1 · released 2026-08-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:54435) **netty: io.netty/netty-codec-http: Netty: Denial of Service via memory exhaustion in SPDY-to-HTTP codec** — rated Important by Red Hat. Released 2026-07-21, updated 2026-09-22. Affected: - OpenShift Serverless - Red Hat AMQ Clients - Red Hat build of Apache Camel - HawtIO 4 - Red Hat build of Apache Camel 4 for Quarkus 3 - Red Hat build of Apicurio Registry 3 - Red Hat build of Debezium 3 - Red Hat Build of Keycloak - Red Hat Data Grid 8 - Red Hat Enterprise Linux AI (RHEL AI) 3 - Red Hat JBoss Enterprise Application Platform 7 - Red Hat OpenShift Dev Spaces - Red Hat Single Sign-On 7 - streams for Apache Kafka 2 Fixed: - Red Hat JBoss EAP 8.1 for RHEL 10 - Red Hat JBoss EAP 8.1 for RHEL 8 - Cryostat 4 on RHEL 9 - Red Hat JBoss EAP 8.1 for RHEL 9 - Red Hat AMQ Broker 7.13.6 - Red Hat AMQ Broker 7.14.1 - Red Hat Build of Apache Camel 4.18 for Quarkus 3.33 - Red Hat Data Grid 8.6.3 - Red Hat OpenShift AI 2.25 - Red Hat OpenShift Dev Spaces 3.30 - Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16 - Red Hat build of Quarkus 3.27.4.SP3 - Red Hat build of Quarkus 3.33.2.SP3 - Streams for Apache Kafka 3.2.1 No fix planned: - Red Hat build of Debezium 3 - Red Hat JBoss Enterprise Application Platform 7 - OpenShift Serverless - Red Hat AMQ Clients - Red Hat build of Apache Camel - HawtIO 4 - Red Hat build of Apache Camel 4 for Quarkus 3 - Red Hat build of Apicurio Registry 3 - Red Hat Build of Keycloak - Red Hat Data Grid 8 - Red Hat Enterprise Linux AI (RHEL AI) 3 - Red Hat OpenShift Dev Spaces - Red Hat Single Sign-On 7 - streams for Apache Kafka 2 Not affected: - Cryostat 4 on RHEL 9 - Red Hat OpenShift AI 2.25 - Red Hat OpenShift Dev Spaces 3.30 - Red Hat JBoss Enterprise Application Platform 7 - Red Hat JBoss Enterprise Application Platform Expansion Pack - Red Hat OpenShift AI (RHOAI) - Red Hat Satellite 6 ## Remediation Before applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:70230 Before applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:70228 Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:68333 ## Package advisory (CVE-2026-56745) Affected packages: - `io.netty:netty-codec-http >= 4.2.0.Final, <= 4.2.15.Final` - `io.netty:netty-codec-http >= 4.1.0.Final, <= 4.1.135.Final` Patched in: - `io.netty:netty-codec-http 4.2.16.Final` - `io.netty:netty-codec-http 4.1.136.Final` Source: https://github.com/advisories/GHSA-jppx-w49h-x2qq