Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-06-12T14:45:04 netty: Netty: Denial of Service due to memory exhaustion in HTTP/3 codec 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CWE-770

Netty is a network application framework for development of protocol servers and clients. Starting in version 4.2.0.Final and prior to version 4.2.15.Final, a memory exhaustion vulnerability in the Netty HTTP/3 codec allows the creation of an infinite number of blocked streams, which can cause OOM error. Version 4.2.15.Final patches the issue.

A flaw was found in Netty. A remote attacker can exploit a memory exhaustion vulnerability in the Netty HTTP/3 codec by creating an infinite number of blocked streams. This can lead to an Out Of Memory (OOM) error, resulting in a Denial of Service (DoS) for the affected system.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Red Hat build of Apache Camel - HawtIO 4 Under investigation netty-codec-http3 https://www.cve.org/CVERecord?id=CVE-2026-48748 https://nvd.nist.gov/vuln/detail/CVE-2026-48748 https://github.com/netty/netty/releases/tag/netty-4.2.15.Final https://github.com/netty/netty/security/advisories/GHSA-4grm-h2qv-h6w6