Description
A vulnerability was found in Undertow where the ProxyProtocolReadListener reuses the same StringBuilder instance across multiple requests. This issue occurs when the parseProxyProtocolV1 method processes multiple requests on the same HTTP connection. As a result, different requests may share the same StringBuilder instance, potentially leading to information leakage between requests or responses. In some cases, a value from a previous request or response may be erroneously reused, which could lead to unintended data exposure. This issue primarily results in errors and connection termination but creates a risk of data leakage in multi-request environments.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | undertow | < 2.2.36.Final, 2.3.0.Alpha1 – < 2.3.17.Final | 2.2.36.Final |
| Red Hat | HawtIO 4.0.0 for Red Hat build of Apache Camel 4 | — | — |
| Red Hat | Red Hat build of Apache Camel 3.20.7 for Spring Boot | — | — |
| Red Hat | Red Hat build of Apache Camel 4.4.2 for Spring Boot | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 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 for RHEL 8 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 | — | — |
| 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 build of Apache Camel for Spring Boot 3 | — | — |
| Red Hat | Red Hat Build of Keycloak | — | — |
| 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 JBoss Data Grid 7 | — | — |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | — | — |
| Red Hat | Red Hat Process Automation 7 | — | — |
| Red Hat | Red Hat Single Sign-On 7 | — | — |
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 | 2.3.18-1 | — |
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 Enterprise Application Platform Eus 7 | eap7-apache-commons-beanutils | 1.11.0-1.redhat_00001.1.el7eap | RHSA-2025:16667 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-hornetq +3 | 2.4.11-1.Final_redhat_00001.1.el7eap | RHSA-2025:16667 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-jackson-core +4 | 2.10.4-4.redhat_00008.1.el7eap | RHSA-2026:0743 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-jackson-databind +2 | 2.10.4-6.redhat_00008.1.el7eap | RHSA-2026:0743 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-jackson-datatype-jdk8 +2 | 2.10.4-3.redhat_00008.1.el7eap | RHSA-2026:0743 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-jboss-server-migration +21 | 1.7.2-19.Final_redhat_00020.1.el7eap | RHSA-2026:0743, RHSA-2025:16667 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-netty +1 | 4.1.63-6.Final_redhat_00004.1.el7eap | RHSA-2026:0743 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-undertow | 2.0.41-5.SP6_redhat_00001.1.el7eap | RHSA-2026:0743, RHSA-2025:16667 |
| Red Hat Jboss Enterprise Application Platform Eus 7 | eap7-wildfly +4 | 7.3.15-5.GA_redhat_00003.1.el7eap | RHSA-2026:0743, RHSA-2025:16667 |
| Red Hat JBoss EAP 8 | eap8-amazon-ion-java | 1.11.9-2.redhat_00001.1.el8eap | RHSA-2024:7441 |
| Red Hat JBoss EAP 8 | eap8-eap-product-conf-parent +1 | 800.3.1-2.GA_redhat_00002.1.el8eap | RHSA-2024:7441 |
| Red Hat JBoss EAP 8 | eap8-undertow | 2.3.14-2.SP2_redhat_00001.1.el8eap | RHSA-2024:7441 |
| Red Hat JBoss EAP 8 | eap8-wildfly +4 | 8.0.3-13.GA_redhat_00007.1.el8eap | RHSA-2024:7441 |
| Red Hat JBoss EAP 7 | eap7-undertow | 2.2.33-2.SP2_redhat_00001.1.el7eap | RHSA-2024:7736 |
| Red Hat JBoss EAP 7 | eap7-wildfly +4 | 7.4.18-1.GA_redhat_00003.1.el7eap | RHSA-2024:7736 |
| Red Hat JBoss EAP 7 | eap7-wildfly-java-jdk17 | 7.4.18-1.GA_redhat_00003.1.el8eap | RHSA-2024:7736 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.undertow:undertow-core | < 2.2.36.Final | 2.2.36.Final | GHSA-9623-mqmm-5rcf |
| Maven | io.undertow:undertow-core | >= 2.3.0.Alpha1, < 2.3.17.Final | 2.3.17.Final | GHSA-9623-mqmm-5rcf |
Advisories 9
- RHSA-2026:0743 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.16 security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2025:16667 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.15 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2024:7441 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.0 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2024:7736 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4 Security update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- WID-SEC-2025-1559 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2025-0148 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2024-1922 Red Hat JBoss Enterprise Application Platform und Integration Camel K: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Jan 18, 2026
- NCSC-2025-0021 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Jan 22, 2025
- WID-SEC-2024-3307 IBM InfoSphere Information Server: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 20, 2024
References
- RHSA-2024:11023 vendor-advisory
- RHSA-2024:6508 vendor-advisory
- RHSA-2024:6883 vendor-advisory
- RHSA-2024:7441 vendor-advisory
- RHSA-2024:7442 vendor-advisory
- RHSA-2024:7735 vendor-advisory
- RHSA-2024:7736 vendor-advisory
- RHSA-2024:8080 vendor-advisory
- RHSA-2025:16667 vendor-advisory
- RHSA-2026:0743 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2024-7885 vdb-entry
- RHBZ#2305290 issue-tracking