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High · 7.5 CVE-2026-15561 EUVD-2026-55985GHSA-fhmg-q5fc-2m8v

Undertow-core: oom via missing limits in chunked trailer in eap's undertow

Published Aug 11, 2026 · Updated Nov 1, 2026 · Assigned by redhat

Vendor: Red Hat Product: Red Hat JBoss Enterprise Application Platform 7 Product: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 Product: Red Hat JBoss Enterprise Application Platform 7.4.25 Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 Product: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 Product: Red Hat JBoss Enterprise Application Platform 8.1.8.GA Product: Red Hat JBoss Enterprise Application Platform Expansion Pack Package: undertow Package: undertow Ecosystem: Debian Ecosystem: Ubuntu

Description

A flaw was found in EAP's undertow http/1.1 chunked-transfer decoder. missing limits on size and count would allow an attacker to use an unauthenticated connection to drive the JVM to an OutOfMemory error, stopping all deployments on the listener, and achieving Denial of Service.

Affected products

VendorProductAffectedFixed
Red Hat Red Hat JBoss Enterprise Application Platform 7.4.25 — —
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 — —
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.8.GA — —
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 — —
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 — —
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 — —
Red Hat Red Hat JBoss Enterprise Application Platform 7 — —
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack — —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 undertow No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.10 undertow No fix yet —
Ubuntu 26.04 LTS undertow No fix yet —
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 24.04 LTS undertow No fix yet —
Ubuntu Pro 22.04 LTS undertow No fix yet —
Ubuntu Pro 20.04 LTS undertow No fix yet —
Ubuntu Pro 18.04 LTS undertow No fix yet —
Ubuntu Pro 16.04 LTS undertow No fix yet —

Red Hat

Security tracker ↗
ReleasePackageFixed inAdvisory
Red Hat Jboss Enterprise Application Platform Els 7 eap7-activemq-artemis +15 2.16.0-22.redhat_00057.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-glassfish-jsf 2.3.14-11.SP11_redhat_00001.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-ironjacamar +8 1.5.26-2.Final_redhat_00001.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-jackson-core +10 2.18.8-1.redhat_00003.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-jboss-remoting 5.0.31-3.SP2_redhat_00001.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-jboss-server-migration +2 1.10.0-46.Final_redhat_00044.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-netty +26 4.1.135-1.Final_redhat_00001.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-picketlink-api +7 2.5.5-24.SP12_redhat_00016.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-picketlink-bindings +1 2.5.5-30.SP12_redhat_00020.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-undertow 2.2.40-2.SP3_redhat_00001.1.el7eap RHSA-2026:53644
Red Hat Jboss Enterprise Application Platform Els 7 eap7-wildfly +4 7.4.25-2.GA_redhat_00001.1.el7eap RHSA-2026:53644
Red Hat JBoss EAP 8 eap8-activemq-artemis +14 2.40.0-8.redhat_00024.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-apache-cxf +3 4.1.7-1.SP1_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-artemis-wildfly-integration 2.0.5-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-bouncycastle +5 1.85.0-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-cryptacular 1.2.7-1.redhat_00002.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-eap-product-conf-parent +1 801.8.0-1.GA_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-hibernate +2 6.6.54-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-httpcomponents-asyncclient 4.1.5-5.redhat_00008.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-ironjacamar +8 3.0.22-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jackson-core +12 2.18.9-1.redhat_00003.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jakarta-xml-bind-api 4.0.5-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jaxb +9 4.0.7-4.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jaxbintros 2.1.0-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jboss-logging 3.6.3-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jboss-remoting 5.0.31-1.SP2_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jbossws-api 3.1.0-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jbossws-common-tools 2.2.0-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jbossws-cxf 7.4.0-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jbossws-jaxws-undertow-httpspi 3.0.1-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jbossws-spi 5.1.0-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-jsf-impl 4.0.11-2.SP1_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-log4j 2.25.4-1.redhat_00003.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-neethi 3.2.2-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-netty +14 4.1.136-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-nimbus-jose-jwt 9.37.4-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-parsson 1.1.9-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-saaj-impl +1 3.0.6-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-slf4j +1 2.0.18-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-undertow 2.3.26-2.SP3_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-wildfly +3 8.1.8-9.GA_redhat_00006.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-wildfly-elytron +1 2.6.11-1.Final_redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-wildfly-javadocs 8.1.1-12.GA_redhat_00048.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228
Red Hat JBoss EAP 8 eap8-ws-commons-XmlSchema 2.3.2-1.redhat_00001.1.el8eap RHSA-2026:70230, RHSA-2026:70229, RHSA-2026:70228

Advisories 4

References