CVE-2026-44892

Description

Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, the default configuration of the `Http3ConnectionHandler` in the Netty HTTP/3 codec lacks an enforced maximum header size limit. When a peer does not explicitly specify `HTTP3_SETTINGS_MAX_FIELD_SECTION_SIZE`, the implementation defaults to an unbounded limit. This insecure default configuration allows a malicious client or server to send an enormous number of headers, leading to a memory exhaustion Denial of Service via an `OutOfMemoryError`. Version 4.2.15.Final contains a patch.

Weakness classification

• CWE-400: Uncontrolled Resource Consumption
• CWE-1188: Initialization of a Resource with an Insecure Default

Primary references

• security-advisories@github.com — Release Notes
• security-advisories@github.com — Vendor Advisory