REDHAT-BUG-2488442: High severity Netty netty-codec-http2 vulnerability

Published Jun 12, 2026
·
Updated

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

1 affected component
Netty netty-codec-http2<4.1.135.Final, <4.2.15.Final

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade netty-codec-http2 to a version that resolves this vulnerability.

    Fixed in 4.2.15.Final
  2. Upgrade

    Upgrade netty-codec-http2 to a version that resolves this vulnerability.

    Fixed in 4.1.135.Final

Event History

Jun 12, 2026
Data Sourced
via Red Hat·04:03 PM
DescriptionSeverityAffected Software
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Frequently Asked Questions

1

What is the severity of REDHAT-BUG-2488442?

The severity of REDHAT-BUG-2488442 is high, rated at 7.

2

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.

3

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.

4

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.

5

When was REDHAT-BUG-2488442 published?

REDHAT-BUG-2488442 was published on June 12, 2026.

Contact

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