Resource exhaustion in Netty - CVE-2026-46340

Vulnerability identifier: #VU133447

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-2026-46340

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 SCTP message reassembly in netty-transport-sctp when processing non-complete SCTP message fragments. A remote attacker can send a sequence of tiny fragmented DATA chunks that never set the complete flag to cause a denial of service.

Each stream identifier maintains its own accumulator entry, and there is no limit on fragment depth, total buffered bytes, or the number of stream identifiers tracked.

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 High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Development Tools Module
SUSE Package Hub 15
Netezza Appliance
netty-tcnative
netty-tcnative-debugsource
netty-javadoc
netty
JBoss Data Grid

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
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
JBoss Data Grid - update to 8.6.2

• https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch

• Multiple vulnerabilities in Netty
• SUSE update for netty, netty-tcnative
• Multiple vulnerabilities in JBoss Data Grid 8.6
• IBM Netezza Appliance update for Netty