# CVE-2026-5680: eap8-activemq-artemis: A flaw was found in Undertow

CVE-2026-5680 is fixed in 41 products on 1 platform, first by RHSA-2026:70230, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-5680
- Priority: High
- CVSS: 7.5 (important)
- EPSS: 0.0110
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 4, 2026

## Description

A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | eap8-activemq-artemis RHEL 10 | 2.40.0-8.redhat_00024.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-apache-cxf RHEL 10 | 4.1.7-1.SP1_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-artemis-wildfly-integration RHEL 10 | 2.0.5-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-bouncycastle RHEL 10 | 1.85.0-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-cryptacular RHEL 10 | 1.2.7-1.redhat_00002.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-eap-product-conf-parent RHEL 10 | 801.8.0-1.GA_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-hibernate RHEL 10 | 6.6.54-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-httpcomponents-asyncclient RHEL 10 | 4.1.5-5.redhat_00008.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-ironjacamar RHEL 10 | 3.0.22-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jackson-annotations RHEL 10 | 2.18.9-1.redhat_00003.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jackson-core RHEL 10 | 2.18.9-1.redhat_00003.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jackson-databind RHEL 10 | 2.18.9-1.redhat_00003.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jackson-dataformats-text RHEL 10 | 2.18.9-1.redhat_00003.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jackson-jaxrs-providers RHEL 10 | 2.18.9-1.redhat_00003.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jackson-modules-base RHEL 10 | 2.18.9-1.redhat_00003.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jackson-modules-java8 RHEL 10 | 2.18.9-1.redhat_00003.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jakarta-xml-bind-api RHEL 10 | 4.0.5-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jaxb RHEL 10 | 4.0.7-4.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jaxbintros RHEL 10 | 2.1.0-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jboss-logging RHEL 10 | 3.6.3-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jboss-remoting RHEL 10 | 5.0.31-1.SP2_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jbossws-api RHEL 10 | 3.1.0-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jbossws-common-tools RHEL 10 | 2.2.0-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jbossws-cxf RHEL 10 | 7.4.0-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jbossws-jaxws-undertow-httpspi RHEL 10 | 3.0.1-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jbossws-spi RHEL 10 | 5.1.0-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-jsf-impl RHEL 10 | 4.0.11-2.SP1_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-log4j RHEL 10 | 2.25.4-1.redhat_00003.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-neethi RHEL 10 | 3.2.2-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-netty RHEL 10 | 4.1.136-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-netty-transport-native-epoll RHEL 10 | 4.1.136-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-nimbus-jose-jwt RHEL 10 | 9.37.4-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-parsson RHEL 10 | 1.1.9-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-saaj-impl RHEL 10 | 3.0.6-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-slf4j RHEL 10 | 2.0.18-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-undertow RHEL 10 | 2.3.26-2.SP3_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-wildfly RHEL 10 | 8.1.8-9.GA_redhat_00006.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-wildfly-elytron RHEL 10 | 2.6.11-1.Final_redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-wildfly-javadocs RHEL 10 | 8.1.1-12.GA_redhat_00048.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-ws-commons-XmlSchema RHEL 10 | 2.3.2-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |
| Linux | eap8-xml-security RHEL 10 | 3.0.6-1.redhat_00001.1.el10eap | [RHSA-2026:70230](https://patchblox.com/security/data/fix/linux/rhsa-2026-70230.md) | Sep 23, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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