CVE-2026-93558

CVE CVE-2026-93558EUVD EUVD-2026-82929Published 2026-09-18T14:09:01.000ZLast changed 2026-09-22T22:13:19.000ZCVSS 7.5

What the advisory describes

A flaw was found in Netty's WebSocketServerExtensionHandler. A remote, unauthenticated attacker can exploit this vulnerability by using HTTP/1.1 pipelining to send requests faster than the application can respond. This leads to an unbounded growth of a per-connection queue, consuming excessive memory. Eventually, this can cause the Java Virtual Machine (JVM) to exhaust its heap, resulting in a Denial of Service (DoS) for the affected server.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Red Hat — Red Hat AMQ Broker 7
• Red Hat — Red Hat AMQ Clients
• Red Hat — Red Hat Build of Keycloak
• Red Hat — Red Hat Data Grid 8
• Red Hat — Red Hat Fuse 7
• Red Hat — Red Hat JBoss Enterprise Application Platform 7
• Red Hat — Red Hat JBoss Enterprise Application Platform 8
• Red Hat — Red Hat Single Sign-On 7
• Red Hat — Red Hat build of Apache Camel 4 for Quarkus 3
• Red Hat — Red Hat build of Apache Camel for Spring Boot 4
• Red Hat — Red Hat build of Apicurio Registry 3
• Red Hat — Red Hat build of Debezium 3
• Red Hat — Red Hat build of Quarkus

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Red Hat — Red Hat JBoss Enterprise Application Platform
• Red Hat — Red Hat build of Keycloak

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.