Resource exhaustion in Netty - CVE-2026-50560

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Main Vulnerability Database Vulnerabilities #VU133913

Resource exhaustion in Netty - CVE-2026-50560

Published: June 8, 2026


Vulnerability identifier: #VU133913
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-50560
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of SETTINGS_MAX_HEADER_LIST_SIZE in the netty http/2 codec when processing http/2 requests with a client-supplied maximum header list size setting. A remote attacker can send specially crafted http/2 requests to cause a denial of service.

The issue is similar in effect to the HTTP/2 Rapid Reset attack but has a different on-the-wire signature.


Affected software

Netty
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Package Hub 15
Development Tools Module
IBM SPSS Analytic Server
IBM Sterling B2B Integrator
IBM Maximo Application Suite - Manage Component
Red Hat build of Quarkus
IBM Sterling File Gateway
webMethods ControlPlane
webMethods developer portal
netty-tcnative
netty-tcnative-debugsource
netty-javadoc
netty

How to mitigate CVE-2026-50560

Install security update from vendor's website.

Netty - addressed in versions 4.1.135, 4.2.15
IBM Sterling File Gateway - addressed in versions 6.2.1.2.1, 6.2.2.1.1
IBM Sterling B2B Integrator - addressed in versions 6.2.1.2.1, 6.2.2.1.1
IBM Maximo Application Suite - Manage Component - addressed in versions 9.0.28, 9.1.20, 9.2.1
webMethods ControlPlane - update to 11.1 Fix11
webMethods developer portal - update to 11.1 Fix14
netty-tcnative - update to 2.0.79-150200.3.45.1
netty-tcnative-debugsource - update to 2.0.79-150200.3.45.1
Red Hat build of Quarkus - addressed in versions 3.27.4.SP1, 3.33.2.SP1
netty-javadoc - update to 4.1.135-150200.4.50.1
netty - update to 4.1.135-150200.4.50.1

External References

Related Security Bulletins