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CVE-2026-93558Io.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserverextensionhandler leads to denial of service

Red Hat Red Hat Build of Apache Camel 3.33.3.SP2; Red Hat Red Hat Build of Debezium 3.6; Red Hat Red Hat build of Keycloak 26.4; Red Hat Red Hat build of Keycl… Published: (1 month ago)

Description

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.

Weakness (CWE): CWE-1035

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

VendorProductVersions
build keycloak 26.4 —
build keycloak 26.6 —
quarkus 3.27 —
quarkus 3.33 —
Red Hat Red Hat AMQ Broker 7 all versions
Red Hat Red Hat AMQ Clients all versions
Red Hat Red Hat Build of Apache Camel 3.33.3.SP2 all versions
Red Hat Red Hat build of Apache Camel 4 for Quarkus 3 all versions
Red Hat Red Hat build of Apache Camel for Spring Boot 4 all versions
Red Hat Red Hat build of Apicurio Registry 3 all versions
Red Hat Red Hat Build of Debezium 3.6 —
Red Hat Red Hat build of Keycloak 26.4 all versions
Red Hat Red Hat build of Keycloak 26.4.17 —
Red Hat Red Hat build of Keycloak 26.6 all versions
Red Hat Red Hat build of Keycloak 26.6.8 —
Red Hat Red Hat build of Quarkus 3.27.5.SP2 —
Red Hat Red Hat build of Quarkus 3.33.3.SP2 —
Red Hat Red Hat Data Grid 8 all versions
Red Hat Red Hat Fuse 7 —
Red Hat Red Hat JBoss Enterprise Application Platform 7 —
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 —
Red Hat Red Hat Single Sign-On 7 all versions

References and patches