CVEvulnerability
CVE-2026-56819
7.5 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-21
- Last modified
- 2026-07-30
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400, CWE-401
Description
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.
Affected configurations
• netty netty (>= 4.1.0 < 4.1.136)
• netty netty (>= 4.2.0 < 4.2.16)
Related
References
- https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b Patch
- https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6 Patch
- https://github.com/netty/netty/releases/tag/netty-4.1.136.Final Release Notes
- https://github.com/netty/netty/releases/tag/netty-4.2.16.Final Release Notes
- https://github.com/netty/netty/security/advisories/GHSA-93wv-jw9v-4972 Exploit, Vendor Advisory
- https://github.com/netty/netty/security/advisories/GHSA-93wv-jw9v-4972 Exploit, Vendor Advisory