High [CVE-2026-56819] Denial of Service via HTTP/2 DATA frame memory leak
This high-severity Red Hat Linux advisory covers CVE-2026-56819 affecting Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16, Red Hat Build of Apache Camel 4.18 for Quarkus 3.33, Red Hat build of Quarkus 3.27.4.SP3.
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Summary
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.
A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted HTTP/2 DATA frames to applications that use Netty and have HTTP/2 content decompression enabled. This can lead to memory exhaustion, causing the application to crash and resulting in a Denial of Service (DoS).
This is an Important vulnerability in Netty's HTTP/2 codec, which could lead to a denial of service. Red Hat products utilizing netty-codec-http2 with HTTP/2 content decompression enabled are susceptible to memory exhaustion when processing specially crafted HTTP/2 DATA frames.
- 4.2.0
- 4.2.15
- 4.1.0
- 4.1.135
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
- 4.1.136
- 4.2.16
- netty-codec-http2
- devspaces/openvsx-rhel9:1787759145
- devspaces/pluginregistry-rhel9:1787759723
- RHSA-2026:54622
- RHSA-2026:48118
- RHSA-2026:47189
- RHSA-2026:47172
- RHSA-2026:54435
- RHSA-2026:62260
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 12 days ago·verify at source
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