REDHAT-BUG-2488442: High severity Netty netty-codec-http2 vulnerability
Netty is a network application framework for development of protocol servers and clients. In netty-codec-http2 prior to versions 4.1.135.Final and 4.2.15.Final, the DelegatingDecompressorFrameListener class orchestrates HTTP/2 decompression by embedding a per-stream EmbeddedChannel that runs the appropriate decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each decompressed chunk is a pooled ByteBuf handed to an anonymous ChannelInboundHandlerAdapter tail handler, which becomes the sole owner responsible for releasing it. A remote peer could send frames that would result in the flow-controller throwing and so trigger a resource leak which at the end might take down the whole JVM due OOME. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
netty-codec-http2to a version that resolves this vulnerability.Fixed in 4.2.15.Final - Upgrade
Upgrade
netty-codec-http2to a version that resolves this vulnerability.Fixed in 4.1.135.Final
Event History
Frequently Asked Questions
What is the severity of REDHAT-BUG-2488442?
The severity of REDHAT-BUG-2488442 is high, rated at 7.
How do I fix REDHAT-BUG-2488442?
To fix REDHAT-BUG-2488442, update netty-codec-http2 to version 4.1.135.Final or 4.2.15.Final or later.
What are the risks associated with REDHAT-BUG-2488442?
The risks associated with REDHAT-BUG-2488442 include potential denial of service and the possibility of data leaks due to improper HTTP/2 decompression handling.
What versions of netty-codec-http2 are affected by REDHAT-BUG-2488442?
Versions prior to 4.1.135.Final and 4.2.15.Final of netty-codec-http2 are affected by REDHAT-BUG-2488442.
When was REDHAT-BUG-2488442 published?
REDHAT-BUG-2488442 was published on June 12, 2026.