CVE-2026-93488

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

Published: Sep 18, 2026Updated: Sep 22, 2026 Sources: CVE List NVDCWE-770

7.5HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-770

Affected Products

Red Hat

commercial·US

Red Hat AMQ Broker 7On-prem

Operating Systems / linux-distro

Red Hat AMQ ClientsOn-prem

Operating Systems / linux-distro

Red Hat build of Apache Camel 4 for Quarkus 3LibraryLibrary

OSS Libraries / generic-library

Red Hat build of Apache Camel for Spring Boot 4LibraryLibrary

OSS Libraries / generic-library

Red Hat build of Apicurio Registry 3On-prem

DevTools & CI

Red Hat build of Debezium 3On-premLibrary

OSS Libraries / generic-library

Red Hat Build of Keycloak

Web & CMS Plugins

Red Hat Data Grid 8On-premDatabase

Databases / cache-message-queue

and 4 more affected products View all →

Exploitability

Workaround Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://access.redhat.com/errata/RHSA-2026:69440

access.redhat.com

https://access.redhat.com/errata/RHSA-2026:69470

access.redhat.com

https://access.redhat.com/errata/RHSA-2026:70257

access.redhat.com

and 4 more references View all →

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