7.5
High
CVE-2026-93558 Io.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserverextensionhandler leads to denial of service
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.
CVSS 3.1 detail
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitable 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 AMQ Broker 7 | Versions not published | |
| Red Hat AMQ Clients | Versions not published | |
| Red Hat build of Apache Camel 4 for Quarkus 3 | Versions not published | |
| Red Hat build of Apache Camel for Spring Boot 4 | Versions not published | |
| Red Hat build of Apicurio Registry 3 | Versions not published | |
| Red Hat build of Debezium 3 | Versions not published | |
| Red Hat Build of Keycloak | Versions not published | |
| Red Hat build of Quarkus | Versions not published | |
| Red Hat Data Grid 8 | Versions not published |
Show the 13 other branches Hide the 13 other branches
| Product | Affected versions | Fixed in |
|---|---|---|
| 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 Single Sign-On 7 | Versions not published | |
| Red Hat Build of Apache Camel 3.33.3.SP2 4.1 | earliest → < 4.1.138.Final-redhat-00001 | 4.1.138.Final-redhat-00001 |
| Red Hat build of Quarkus 3.27.5.SP2 | Versions not published | |
| Red Hat build of Quarkus 3.33.3.SP2 | Versions not published | |
| Red Hat Build of Debezium 3.6 | Versions not published | |
| Red Hat build of Keycloak 26.4 26.4 | earliest → < 26.4-30 | 26.4-30 |
| Red Hat build of Keycloak 26.6.8 | Versions not published | |
| Red Hat JBoss Enterprise Application Platform 8.1 | Versions not published | |
| Red Hat build of Keycloak 26.4.17 | Versions not published | |
| Red Hat build of Keycloak 26.6 26.6 | earliest → < 26.6-24 | 26.6-24 |
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