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7.5 High

CVE-2026-81624 Undertow-core: undertow: websocketcontainer defaults for buffers and timeouts are infinite

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.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat build of Apache Camel for Spring Boot 4 Versions not published
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Fuse 7 Versions not published
Red Hat JBoss Enterprise Application Platform 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8 Versions not published
Red Hat JBoss Enterprise Application Platform Expansion Pack Versions not published
Red Hat Single Sign-On 7 Versions not published

Other CVEs of Red Hat build of Apache Camel for Spring Boot 4

The 106 CVEs of Red Hat build of Apache Camel for Spring Boot 4 →
CVE-2026-91920 Undertow: undertow: chunkreader message length permits chunk-size overflow 6.5 Medium CVE-2026-114370 Undertow: undertow: pathresourcemanager safepaths check allows sibling-directory symlink traversal 3.7 Low CVE-2026-93562 Io.netty/netty-codec-http: netty: incomplete validation of malformed transfer-encoding allows http request smuggling 6.5 Medium CVE-2026-93574 Io.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsing 6.5 Medium
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