CVE-2026-56816
Fixed in a distro release EPSS <1%CVSS 7.5
Netty is a network application framework for development of protocol servers and clients. Prior to 4.2.16.Final, Netty's `Http3FrameCodec` buffers incoming data for HTTP/3 reserved frame types up to the wire-specified payload length without limits; `decodeFrame` trusts `payLoadLength`, allowing an attacker to open multiple QUIC streams and send reserved frames with very large payload lengths to cause memory exhaustion and denial of service. This issue is fixed in version 4.2.16.Final.
Products: netty
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Maven | io.netty:netty-codec-http3 | 4.2.16.Final |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | apache-hop | 2.18.1-r11 |
| Chainguard | apache-hop-fips | 2.18.1-r6 |
| Chainguard | camunda-8.9 | 8.9.13-r2 |
| Chainguard | camunda-zeebe-8.9 | 8.9.13-r1 |
| Chainguard | celeborn-0.7 | 0.7.0-r10 |
| Chainguard | kafka-strimzi-compat | 1.2.0-r5 |
| Chainguard | kafka_exporter-strimzi-compat | 1.2.0-r4 |
| Chainguard | kafka_exporter-strimzi-compat | 1.2.0-r5 |
| Chainguard | opensearch-3 | 3.7.0-r5 |
| Chainguard | opensearch-3-discovery-ec2 | 3.8.0-r3 |
| Chainguard | opensearch-3-iamguarded-compat | 3.8.0-r3 |
| Chainguard | opensearch-3-neural-search | no fix |
| Chainguard | opensearch-3-repository-azure | 3.7.0-r5 |
| Chainguard | opensearch-3-security | 3.7.0-r5 |
| Chainguard | opensearch-fips-3 | 3.7.0-r5 |
| Chainguard | opensearch-fips-3-repository-azure | 3.7.0-r5 |
| Chainguard | opensearch-fips-3-security | 3.7.0-r5 |
| Chainguard | prometheus-jmx-exporter-strimzi-compat | 1.6.0-r0 |
| Chainguard | spark-4.1-scala-2.13 | 4.1.3-r2 |
| Chainguard | spark-fips-4.1-scala-2.13 | 4.1.2-r6 |
| Chainguard | strimzi-kafka-operator | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-cluster-operator | 1.1.0-r3 |
| Chainguard | strimzi-kafka-operator-cluster-operator | 1.2.0-r4 |
| Chainguard | strimzi-kafka-operator-cluster-operator | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-fips-cluster-operator | 1.1.0-r1 |
| Chainguard | strimzi-kafka-operator-fips-kafka-agent | 1.1.0-r1 |
| Chainguard | strimzi-kafka-operator-fips-kafka-init | 1.1.0-r1 |
| Chainguard | strimzi-kafka-operator-fips-topic-operator | 1.1.0-r1 |
| Chainguard | strimzi-kafka-operator-fips-tracing-agent | 1.1.0-r1 |
| Chainguard | strimzi-kafka-operator-fips-user-operator | 1.1.0-r1 |
| Chainguard | strimzi-kafka-operator-kafka-agent | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-kafka-agent | 1.1.0-r3 |
| Chainguard | strimzi-kafka-operator-kafka-agent | no fix |
| Chainguard | strimzi-kafka-operator-kafka-base | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-kafka-base | no fix |
| Chainguard | strimzi-kafka-operator-kafka-init | no fix |
| Chainguard | strimzi-kafka-operator-kafka-init | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-kafka-init | 1.1.0-r3 |
| Chainguard | strimzi-kafka-operator-kafka-thirdparty-libs | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-kafka-thirdparty-libs-cc | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-topic-operator | 1.1.0-r3 |
| Chainguard | strimzi-kafka-operator-topic-operator | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-topic-operator | 1.2.0-r4 |
| Chainguard | strimzi-kafka-operator-tracing-agent | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-tracing-agent | 1.1.0-r3 |
| Chainguard | strimzi-kafka-operator-user-operator | 1.2.0-r5 |
| Chainguard | strimzi-kafka-operator-user-operator | 1.1.0-r3 |
| Debian 12 | netty | no fix |
| Debian 13 | netty | no fix |
| Debian 14 | netty | no fix |
| Ubuntu 26.10 | netty | no fix |
| Ubuntu Pro 14.04 LTS | netty | no fix |
| Ubuntu Pro 16.04 LTS | netty | no fix |
| Ubuntu Pro 18.04 LTS | netty | no fix |
| Ubuntu Pro 20.04 LTS | netty | no fix |
| Ubuntu Pro 22.04 LTS | netty | no fix |
| Ubuntu Pro 24.04 LTS | netty | no fix |
| Ubuntu Pro 26.04 LTS | netty | no fix |
| Wolfi | kafka-strimzi-compat | 1.2.0-r5 |
| Wolfi | kafka_exporter-strimzi-compat | 1.2.0-r4 |
| Wolfi | kafka_exporter-strimzi-compat | 1.2.0-r5 |
| Wolfi | opensearch-3 | 3.7.0-r5 |
| Wolfi | opensearch-3-discovery-ec2 | 3.8.0-r3 |
| Wolfi | opensearch-3-iamguarded-compat | 3.8.0-r3 |
| Wolfi | opensearch-3-neural-search | no fix |
| Wolfi | opensearch-3-repository-azure | 3.7.0-r5 |
| Wolfi | opensearch-3-security | 3.7.0-r5 |
| Wolfi | prometheus-jmx-exporter-strimzi-compat | 1.6.0-r0 |
| Wolfi | spark-4.1-scala-2.13 | 4.1.3-r2 |
| Wolfi | strimzi-kafka-operator | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-cluster-operator | 1.1.0-r3 |
| Wolfi | strimzi-kafka-operator-cluster-operator | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-cluster-operator | 1.2.0-r4 |
| Wolfi | strimzi-kafka-operator-kafka-agent | no fix |
| Wolfi | strimzi-kafka-operator-kafka-agent | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-kafka-agent | 1.1.0-r3 |
| Wolfi | strimzi-kafka-operator-kafka-base | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-kafka-base | no fix |
| Wolfi | strimzi-kafka-operator-kafka-init | no fix |
| Wolfi | strimzi-kafka-operator-kafka-init | 1.1.0-r3 |
| Wolfi | strimzi-kafka-operator-kafka-init | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-kafka-thirdparty-libs | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-kafka-thirdparty-libs-cc | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-topic-operator | 1.2.0-r4 |
| Wolfi | strimzi-kafka-operator-topic-operator | 1.1.0-r3 |
| Wolfi | strimzi-kafka-operator-topic-operator | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-tracing-agent | 1.1.0-r3 |
| Wolfi | strimzi-kafka-operator-tracing-agent | 1.2.0-r5 |
| Wolfi | strimzi-kafka-operator-user-operator | 1.1.0-r3 |
| Wolfi | strimzi-kafka-operator-user-operator | 1.2.0-r5 |