Resource exhaustion in Netty - CVE-2026-47244

Vulnerability identifier: #VU133445

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-47244

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to uncontrolled resource consumption in the HTTP/2 stream management logic when handling HTTP/2 connections without an explicitly configured concurrent stream limit. A remote attacker can open a large number of streams over a single TCP connection to cause a denial of service.

The issue occurs when the application does not explicitly configure a maximum concurrent streams setting.

Netty
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Development Tools Module
SUSE Package Hub 15
Netezza Appliance
webMethods developer portal
webMethods ControlPlane
IBM SPSS Analytic Server
IBM Maximo Application Suite - Manage Component
netty-tcnative
netty-tcnative-debugsource
netty-javadoc
netty

Install security update from vendor's website.

Netty - addressed in versions 4.1.135, 4.2.15
Netezza Appliance - update to 1.0.2.0
IBM Maximo Application Suite - Manage Component - addressed in versions 9.0.28, 9.1.20, 9.2.1
webMethods developer portal - update to 11.1 Fix14
webMethods ControlPlane - update to 11.1 Fix11
netty-tcnative - update to 2.0.79-150200.3.45.1
netty-tcnative-debugsource - update to 2.0.79-150200.3.45.1
netty-javadoc - update to 4.1.135-150200.4.50.1
netty - update to 4.1.135-150200.4.50.1

• https://github.com/netty/netty/security/advisories/GHSA-5x3r-wrvg-rp6q
• https://www.rfc-editor.org/rfc/rfc7540.html#section-6.5.2

• Multiple vulnerabilities in Netty
• Multiple vulnerabilities in IBM SPSS Analytic Server
• SUSE update for netty, netty-tcnative
• Multiple vulnerabilities in IBM Maximo Application Suite - Manage Component
• Multiple vulnerabilities in IBM Netezza Appliance
• Multiple vulnerabilities in IBM webMethods API Management