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Vulnerability · Published Sep 18, 2026 · Assigned by redhat

CVE-2026-93488Io.netty/netty-codec-http: netty: denial of service via unbounded concurrent spdy streams

High 7.5

In plain English

A high-severity resource allocation without limits in Red Hat AMQ Broker 7 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 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 43.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in Netty. SpdySessionHandler accepts an unlimited number of concurrent remote-initiated streams because localConcurrentStreams defaults to Integer.MAX_VALUE and the handler provides no API to change it. A remote peer can open a SPDY connection and send a large number of SYN_STREAM frames with FLAG_FIN=0, causing unbounded heap and direct memory allocation that can lead to JVM OutOfMemoryError and a denial of service.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12nettyno fix listedDEBIAN-CVE-2026-93488
Debian:13nettyno fix listedDEBIAN-CVE-2026-93488
Debian:14nettyno fix listedDEBIAN-CVE-2026-93488
Ubuntu:26.10nettyno fix listedUBUNTU-CVE-2026-93488

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Build of Apache Camel 3.33.3.SP2 see references
Red Hat Red Hat Build of Debezium 3.6 see references
Red Hat Red Hat build of Quarkus 3.27.5.SP2 see references
Red Hat Red Hat build of Quarkus 3.33.3.SP2 see references
Red Hat Red Hat AMQ Broker 7 see references
Red Hat Red Hat AMQ Clients see references
Red Hat Red Hat build of Apache Camel 4 for Quarkus 3 see references
Red Hat Red Hat build of Apache Camel for Spring Boot 4 see references
Red Hat Red Hat build of Apicurio Registry 3 see references
Red Hat Red Hat Build of Keycloak see references
Red Hat Red Hat Data Grid 8 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 8 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