Vulnerability · Published Aug 31, 2026 · Assigned by redhat
CVE-2026-81624Undertow-core: undertow: websocketcontainer defaults for buffers and timeouts are infinite
High 7.5
In plain English
A high-severity resource allocation without limits in Red Hat build of Apache Camel for Spring Boot 4 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Official description
Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | undertow | no fix listed | DEBIAN-CVE-2026-81624 |
| Ubuntu:26.04:LTS | undertow | no fix listed | UBUNTU-CVE-2026-81624 |
| Ubuntu:26.10 | undertow | no fix listed | UBUNTU-CVE-2026-81624 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Fuse 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform 8 | see references |
| Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | see references |
| Red Hat | Red Hat Single Sign-On 7 | see references |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-81624 vdb-entry, x_refsource_REDHAT
- RHBZ#2524868 issue-tracking, x_refsource_REDHAT