Description
A flaw was found in undertow. The HTTP2SourceChannel fails to write the final frame under some circumstances, resulting in a denial of service. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.35.SP1, prior to 2.2.6.SP1, prior to 2.2.7.SP1, prior to 2.0.36.SP1, prior to 2.2.9.Final and prior to 2.0.39.Final.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | undertow | undertow 2.0.35.SP1, undertow 2.2.6.SP1, undertow 2.2.7.SP1, undertow 2.0.36.SP1, undertow 2.2.9.Final, undertow 2.0.39.Final | — |
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 | 2.2.10-1 | — |
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 EAP 7 | eap7-apache-commons-io | 2.10.0-1.redhat_00001.1.el6eap | RHSA-2021:3658, RHSA-2021:3656, RHSA-2021:3468 |
| Red Hat JBoss EAP 7 | eap7-hal-console | 3.2.16-1.Final_redhat_00001.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-hibernate +4 | 5.3.20-4.SP2_redhat_00001.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-ironjacamar +8 | 1.4.35-1.Final_redhat_00001.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-jakarta-el | 3.0.3-2.redhat_00006.1.el6eap | RHSA-2021:3658, RHSA-2021:3656, RHSA-2021:3468 |
| Red Hat JBoss EAP 7 | eap7-jberet +1 | 1.3.9-1.Final_redhat_00001.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-jboss-remoting | 5.0.23-2.SP1_redhat_00001.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-jboss-server-migration +21 | 1.7.2-9.Final_redhat_00010.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-narayana +10 | 5.9.12-1.Final_redhat_00001.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-netty +1 | 4.1.63-1.Final_redhat_00001.1.el7eap | RHSA-2021:3658, RHSA-2021:3656 |
| Red Hat JBoss EAP 7 | eap7-picketbox +1 | 5.0.3-9.Final_redhat_00008.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-undertow | 2.0.39-1.SP2_redhat_00001.1.el6eap | RHSA-2021:3658, RHSA-2021:3656, RHSA-2021:3468 |
| Red Hat JBoss EAP 7 | eap7-velocity +1 | 2.3.0-1.redhat_00001.1.el7eap | RHSA-2021:3658, RHSA-2021:3656 |
| Red Hat JBoss EAP 7 | eap7-wildfly +2 | 7.3.9-2.GA_redhat_00002.1.el6eap | RHSA-2021:3658, RHSA-2021:3656, RHSA-2021:3468 |
| Red Hat JBoss EAP 7 | eap7-wildfly-elytron +1 | 1.15.5-1.Final_redhat_00001.1.el7eap | RHSA-2021:3658, RHSA-2021:3656 |
| Red Hat JBoss EAP 7 | eap7-wildfly-http-client +4 | 1.0.29-1.Final_redhat_00002.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
| Red Hat JBoss EAP 7 | eap7-wildfly-java-jdk8 +1 | 7.3.9-2.GA_redhat_00002.1.el7eap | RHSA-2021:3656, RHSA-2021:3467 |
| Red Hat JBoss EAP 7 | eap7-wildfly-transaction-client | 1.1.14-2.Final_redhat_00001.1.el6eap | RHSA-2021:3468, RHSA-2021:3467, RHSA-2021:3466 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.undertow:undertow-core | >= 2.1.0, < 2.2.9.Final | 2.2.9.Final | GHSA-mfhv-gwf8-4m88 |
| Maven | io.undertow:undertow-core | < 2.0.39.Final | 2.0.39.Final | GHSA-mfhv-gwf8-4m88 |
Advisories 7
- RHSA-2021:3658 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.1 security update on RHEL 8 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2021:3656 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.1 security update on RHEL 7 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2021:3468 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.9 security update on RHEL 8 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2021:3467 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.9 security update on RHEL 7 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2021:3466 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.9 security update on RHEL 6 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- WID-SEC-2025-1459 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 3, 2025
- WID-SEC-2022-0916 Red Hat JBoss Enterprise Application Platform: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 24, 2025