Netty HTTP Protocol Parsing Flaws

Netty HTTP/2 servers can be rendered unresponsive by remote attackers flooding CONTINUATION frames with zero-byte payloads, bypassing existing header size limits and exhausting CPU resources. The affected package is io.netty:netty-codec-http2 (tracked via GitHub Security Advisory GHSA-w9fj-cfpg-grvv). Authentication requirements are not confirmed from available data. No public exploit identified at time of analysis, though the technical details provided in the advisory enable straightforward reproduction. The low bandwidth requirement for this CPU-based denial of service makes it highly practical for disrupting services at scale.

CVE-2026-33870 is a security vulnerability (CVSS 7.5). High severity vulnerability requiring prompt remediation.