--- id: CVE-2026-15561 title: A flaw was found in EAP's undertow http/1.1 chunked-transfer decoder summary: >- 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… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-770 vendor: Red Hat product: io.undertow/undertow-core affected: - io.undertow/undertow-core (all versions) - eap7-activemq-artemis (all versions) - eap7-glassfish-jsf (all versions) - eap7-ironjacamar (all versions) - eap7-jackson-annotations (all versions) - eap7-jackson-core (all versions) - eap7-jackson-databind (all versions) - eap7-jackson-jaxrs-providers (all versions) - eap7-jackson-modules-base (all versions) - eap7-jackson-modules-java8 (all versions) - eap7-jboss-remoting (all versions) - eap7-jboss-server-migration (all versions) - eap7-netty (all versions) - eap7-netty-transport-native-epoll (all versions) - eap7-picketlink-bindings (all versions) - eap7-picketlink-federation (all versions) - eap7-undertow (all versions) - eap7-wildfly (all versions) - eap7-activemq-artemis (all versions) - eap7-glassfish-jsf (all versions) - eap7-ironjacamar (all versions) - eap7-jackson-annotations (all versions) - eap7-jackson-core (all versions) - eap7-jackson-databind (all versions) - eap7-jackson-jaxrs-providers (all versions) - eap7-jackson-modules-base (all versions) - eap7-jackson-modules-java8 (all versions) - eap7-jboss-remoting (all versions) - eap7-jboss-server-migration (all versions) - eap7-netty (all versions) - eap7-netty-transport-native-epoll (all versions) - eap7-picketlink-bindings (all versions) - eap7-picketlink-federation (all versions) - eap7-undertow (all versions) - eap7-wildfly (all versions) - eap7-activemq-artemis (all versions) - eap7-glassfish-jsf (all versions) - eap7-ironjacamar (all versions) - eap7-jackson-annotations (all versions) - eap7-jackson-core (all versions) - eap7-jackson-databind (all versions) - eap7-jackson-jaxrs-providers (all versions) - eap7-jackson-modules-base (all versions) - eap7-jackson-modules-java8 (all versions) - eap7-jboss-remoting (all versions) - eap7-jboss-server-migration (all versions) - eap7-netty (all versions) - eap7-netty-transport-native-epoll (all versions) - eap7-picketlink-bindings (all versions) - eap7-picketlink-federation (all versions) patched: - jboss_eap_7_4_els_for_rhel_7_server - jboss_eap_7_4_els_for_rhel 8 - jboss_eap_7_4_els_for_rhel 9 published: '2026-08-11' updated: '2026-09-25' sourceUpdated: '2026-09-25T13:17:10.180' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15561' references: - url: 'https://access.redhat.com/errata/RHSA-2026:53644' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:53645' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:53646' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:53806' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:70228' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:70229' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:70230' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:70277' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-15561' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2483133' label: secalert@redhat.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-15561.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-15561' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15561' tags: - nvd - cve.org - csaf - vex - red-hat ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-08-11T16:09:41.801549Z' epss: 0.00449 epssPercentile: 0.36263 ingestedAt: '2026-09-17T19:26:25.289Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:53644** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53644) - **RHSA-2026:53645** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 8 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53645) - **RHSA-2026:53646** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 9 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53646) - **Red Hat VEX** · Important · affected: Red Hat JBoss Enterprise Application Platform 8 · no fix planned: Red Hat JBoss Enterprise Application Platform 8 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-15561.json) - **RHSA-2026:70230** · Red Hat · fixed in: Red Hat JBoss EAP 8.1 for RHEL 10 · released 2026-09-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:70230) - **RHSA-2026:70228** · Red Hat · fixed in: Red Hat JBoss EAP 8.1 for RHEL 8 · released 2026-09-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:70228) - **RHSA-2026:70229** · Red Hat · fixed in: Red Hat JBoss EAP 8.1 for RHEL 9 · released 2026-09-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:70229)