Description
A flaw was found in Undertow that can cause remote denial of service attacks. When the server uses the FormEncodedDataDefinition.doParse(StreamSourceChannel) method to parse large form data encoding with application/x-www-form-urlencoded, the method will cause an OutOfMemory issue. This flaw allows unauthorized users to cause a remote denial of service (DoS) attack.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4.24 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.0 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 9 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8.1.3 | — | — |
| 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 | OpenShift Serverless | — | — |
| Red Hat | Red Hat build of Apache Camel 4 for Quarkus 3 | — | — |
| Red Hat | Red Hat build of Apache Camel for Spring Boot 3 | — | — |
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 | — | — |
| Red Hat | Red Hat build of Apache Camel - HawtIO 4 | — | — |
| Red Hat | Red Hat build of Apicurio Registry 2 | — | — |
| Red Hat | Red Hat Build of Keycloak | — | — |
| Red Hat | Red Hat build of OptaPlanner 8 | — | — |
| Red Hat | Red Hat build of Quarkus | — | — |
| Red Hat | Red Hat Data Grid 8 | — | — |
| Red Hat | Red Hat Fuse 7 | — | — |
| Red Hat | Red Hat Integration Camel K 1 | — | — |
| Red Hat | Red Hat Integration Camel Quarkus 2 | — | — |
| Red Hat | Red Hat JBoss Data Grid 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | — | — |
| Red Hat | Red Hat JBoss Fuse Service Works 6 | — | — |
| Red Hat | Red Hat Process Automation 7 | — | — |
| Red Hat | Red Hat Single Sign-On 7 | — | — |
| Red Hat | streams for Apache Kafka | — | — |
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 ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | undertow | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | undertow | No fix yet | — |
| Ubuntu 26.04 LTS | undertow | No fix yet | — |
| Ubuntu 25.10 | undertow | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-apache-cxf +3 | 3.1.16-6.redhat_00006.1.ep7.el7 | RHSA-2026:6012, RHSA-2026:6011 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-eclipse-jgit | 5.13.5.202508271544-1.r_redhat_00001.1.el7eap | RHSA-2026:6011 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-hibernate +5 | 5.1.17-4.Final_redhat_00005.1.ep7.el7 | RHSA-2026:6012, RHSA-2026:6011 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-jbossws-cxf | 5.1.11-1.SP1_redhat_00001.1.ep7.el7 | RHSA-2026:6012, RHSA-2026:6011 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-undertow | 1.4.18-19.SP17_redhat_00001.1.ep7.el7 | RHSA-2026:6012, RHSA-2026:6011 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-wildfly +1 | 7.1.14-4.GA_redhat_00003.1.ep7.el7 | RHSA-2026:6012, RHSA-2026:6011 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-wildfly-javadocs +2 | 7.3.17-5.GA_redhat_00006.1.el7eap | RHSA-2026:6011 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-apache-cxf +3 | 3.5.11-1.SP1_redhat_00001.1.el7eap | RHSA-2026:4917, RHSA-2026:4916, RHSA-2026:4915 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-eclipse-jgit | 5.13.5.202508271544-2.r_redhat_00001.1.el7eap | RHSA-2026:4917, RHSA-2026:4916, RHSA-2026:4915 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-hibernate +4 | 5.3.38-1.Final_redhat_00001.1.el7eap | RHSA-2026:4917, RHSA-2026:4916, RHSA-2026:4915 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-jboss-marshalling +1 | 2.0.16-1.Final_redhat_00001.1.el7eap | RHSA-2026:4917, RHSA-2026:4916, RHSA-2026:4915 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-netty +26 | 4.1.124-1.Final_redhat_00001.1.el7eap | RHSA-2026:4917, RHSA-2026:4916, RHSA-2026:4915 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-undertow | 2.2.39-1.Final_redhat_00001.1.el7eap | RHSA-2026:4917, RHSA-2026:4916, RHSA-2026:4915 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-wildfly +4 | 7.4.24-4.GA_redhat_00002.1.el7eap | RHSA-2026:4917, RHSA-2026:4916, RHSA-2026:4915 |
| Red Hat Jboss Enterprise Application Platform Els 7 | eap7-wildfly-java-jdk17 | 7.4.24-4.GA_redhat_00002.1.el8eap | RHSA-2026:4917, RHSA-2026:4916 |
| Red Hat JBoss EAP 8 | eap8-apache-cxf +3 | 4.0.10-1.redhat_00001.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-bouncycastle +5 | 1.82.0-1.redhat_00001.1.el8eap | RHSA-2026:3891, RHSA-2026:3889, RHSA-2026:0384 |
| Red Hat JBoss EAP 8 | eap8-eap-product-conf-parent +1 | 801.3.0-1.GA_redhat_00001.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-eventstream | 1.0.1-3.redhat_00003.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-guava +1 | 33.0.0-2.jre_redhat_00003.1.el8eap | RHSA-2026:3891, RHSA-2026:3889 |
| Red Hat JBoss EAP 8 | eap8-hibernate +2 | 6.6.36-1.Final_redhat_00001.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-jaxb +9 | 4.0.6-1.redhat_00001.1.el8eap | RHSA-2026:3891, RHSA-2026:3889 |
| Red Hat JBoss EAP 8 | eap8-jboss-el-api_5.0_spec | 4.0.2-1.Final_redhat_00001.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-jboss-threads | 2.5.0-1.redhat_00001.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-jcip-annotations | 1.0.0-3.redhat_00009.1.el8eap | RHSA-2026:3891, RHSA-2026:3889 |
| Red Hat JBoss EAP 8 | eap8-slf4j-jboss-logmanager | 2.0.2-1.Final_redhat_00001.1.el8eap | RHSA-2026:3891, RHSA-2026:3889 |
| Red Hat JBoss EAP 8 | eap8-undertow | 2.3.20-2.SP4_redhat_00001.1.el8eap | RHSA-2026:3891, RHSA-2026:3889, RHSA-2026:0384 |
| Red Hat JBoss EAP 8 | eap8-wildfly +3 | 8.1.3-4.GA_redhat_00006.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-wildfly-clustering +19 | 5.0.12-1.Final_redhat_00001.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-wildfly-elytron +1 | 2.6.6-1.Final_redhat_00001.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
| Red Hat JBoss EAP 8 | eap8-wildfly-javadocs | 8.1.1-4.GA_redhat_00007.1.el8eap | RHSA-2026:0384, RHSA-2026:0383 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | wildfly-openjdk-17 +1 | 39.0.0-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.undertow:undertow-core | < 2.2.39.Final | 2.2.39.Final | GHSA-6h4f-pj3g-q8fq |
| Maven | io.undertow:undertow-core | >= 2.4.0.Alpha1, < 2.4.0.Beta1 | 2.4.0.Beta1 | GHSA-6h4f-pj3g-q8fq |
| Maven | io.undertow:undertow-core | >= 2.3.0.Alpha1, < 2.3.21.Final | 2.3.21.Final | GHSA-6h4f-pj3g-q8fq |
Advisories 10
- RHSA-2026:4917 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:4916 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:4915 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.24 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:6011 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.17 security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:6012 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.14 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:3891 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.0.12 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:3889 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.0.12 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:0384 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.3 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- RHSA-2026:0383 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.3 security update Red Hat Security Advisories (RHSA) · Oct 15, 2026
- WID-SEC-2026-0054 Red Hat JBoss Enterprise Application Platform (Undertow): Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 29, 2026
References
- RHSA-2026:0383 vendor-advisory
- RHSA-2026:0384 vendor-advisory
- RHSA-2026:0386 vendor-advisory
- RHSA-2026:3889 vendor-advisory
- RHSA-2026:3891 vendor-advisory
- RHSA-2026:3892 vendor-advisory
- RHSA-2026:4915 vendor-advisory
- RHSA-2026:4916 vendor-advisory
- RHSA-2026:4917 vendor-advisory
- RHSA-2026:4924 vendor-advisory
- RHSA-2026:6011 vendor-advisory
- RHSA-2026:6012 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2024-3884 vdb-entry
- RHBZ#2275287 issue-tracking