CVE-2026-56819

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, a remote unauthenticated peer can leak one direct `ByteBuf` per HTTP/2 `DATA` frame in applications that enable HTTP/2 content decompression via `DelegatingDecompressorFrameListener`. When a `DATA` frame is processed for a stream whose decompressor has already been closed, `Http2Decompressor.decompress(...)` calls `decompressor.writeInbound(data.retain())` and does not release the retained buffer on the error path, eventually exhausting direct memory and crashing the JVM. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

• CWE-400
• CWE-401

• https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bPatch
• https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6Patch
• https://github.com/netty/netty/releases/tag/netty-4.1.136.FinalRelease Notes
• https://github.com/netty/netty/releases/tag/netty-4.2.16.FinalRelease Notes
• https://github.com/netty/netty/security/advisories/GHSA-93wv-jw9v-4972Exploit, Vendor Advisory
• https://github.com/netty/netty/security/advisories/GHSA-93wv-jw9v-4972Exploit, Vendor Advisory

Published

Jul 21, 2026

Last Modified

Jul 30, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-56813Improper Neutralization of Parameter/Argument Delimiters vul…2.1
• CVE-2026-56814Plug.Parsers.MULTIPART, the multipart request-body parser us…6.9
• CVE-2026-56815pwnlift before d7a9544, in a privileged deployment, contains…7.4
• CVE-2026-56816Netty is a network application framework for development of …7.5
• CVE-2026-56817Netty is a network application framework for development of …9.8
• CVE-2026-56818Netty is an asynchronous, event-driven network application f…6.5
• CVE-2026-5682A vulnerability has been found in Meesho Online Shopping App…3.7
• CVE-2026-56820Netty is a network application framework for development of …9.1
• CVE-2026-56821Netty is an asynchronous, event-driven network application f…7.4
• CVE-2026-56822Netty is an asynchronous, event-driven network application f…7.4
• CVE-2026-56823AutoGPT is a workflow automation platform for creating, depl…5.4
• CVE-2026-5683A vulnerability was found in Tenda CX12L 16.03.53.12. Affect…8