Description
A flaw was found in Undertow. Denial of service can be achieved as Undertow server waits for the LAST_CHUNK forever for EJB invocations.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | undertow | undertow 2.x | — |
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 | 2.2.21-1 | — |
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 Single Sign On 7 | rh-sso7-keycloak +1 | 18.0.6-1.redhat_00001.1.el7sso | RHSA-2023:1045, RHSA-2023:1044, RHSA-2023:1043 |
| Red Hat JBoss EAP 7 | eap7-undertow | 2.2.20-1.SP1_redhat_00001.1.el7eap | RHSA-2022:8792, RHSA-2022:8791, RHSA-2022:8790 |
Advisories 8
- RHSA-2023:1045 Red Hat Security Advisory: Red Hat Single Sign-On 7.6.2 security update on RHEL 9 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2023:1044 Red Hat Security Advisory: Red Hat Single Sign-On 7.6.2 security update on RHEL 8 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2023:1043 Red Hat Security Advisory: Red Hat Single Sign-On 7.6.2 security update on RHEL 7 Red Hat Security Advisories (RHSA) · Oct 13, 2026
- RHSA-2022:8792 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.8 Security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8790 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.8 Security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2022:8791 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.8 Security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- WID-SEC-2025-1459 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 3, 2025
- WID-SEC-2022-2229 Red Hat JBoss Enterprise Application Platform: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Mar 1, 2023