CVE-2026-56819
Fixed in a distro release EPSS <1%CVSS 7.5
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.
Products: netty
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Maven | io.netty:netty-codec-http2 | 4.2.16.Final |
| Maven | io.netty:netty-codec-http2 | 4.1.136.Final |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | apache-camel-karavan-devmode | 4.18.1-r8 |
| Chainguard | apache-pulsar-4.1 | 4.1.3-r15 |
| Chainguard | apache-pulsar-fips-4.1 | no fix |
| Chainguard | camunda-zeebe-8.6 | 8.6.39-r6 |
| Chainguard | celeborn-0.5 | no fix |
| Chainguard | celeborn-0.5 | 0.5.4-r32 |
| Chainguard | celeborn-0.6 | 0.6.3-r13 |
| Chainguard | celeborn-0.6 | no fix |
| Chainguard | celeborn-0.7 | 0.7.0-r6 |
| Chainguard | celeborn-0.7 | 0.7.0-r3 |
| Chainguard | commercial-elasticsearch-8.17 | no fix |
| Chainguard | commercial-elasticsearch-8.19 | 8.19.22-r0 |
| Chainguard | commercial-elasticsearch-9.1 | no fix |
| Chainguard | commercial-elasticsearch-9.2 | no fix |
| Chainguard | commercial-elasticsearch-9.3 | no fix |
| Chainguard | commercial-elasticsearch-9.4 | 9.4.8-r0 |
| Chainguard | commercial-elasticsearch-9.5 | 9.5.5-r0 |
| Chainguard | druid | 37.0.0-r46 |
| Chainguard | druid | 37.0.0-r47 |
| Chainguard | druid | 37.0.0-r56 |
| Chainguard | elasticsearch-9.1 | 9.1.10-r9 |
| Chainguard | elasticsearch-9.1-iamguarded | 9.1.10-r9 |
| Chainguard | elasticsearch-9.1-iamguarded-fips | no fix |
| Chainguard | elasticsearch-9.2 | 9.2.8-r8 |
| Chainguard | elasticsearch-9.2-iamguarded | 9.2.8-r8 |
| Chainguard | elasticsearch-9.2-iamguarded-fips | no fix |
| Chainguard | elasticsearch-9.3 | no fix |
| Chainguard | elasticsearch-9.3-iamguarded | 9.3.8-r6 |
| Chainguard | elasticsearch-9.3-iamguarded-fips | no fix |
| Chainguard | elasticsearch-9.4 | 9.4.5-r4 |
| Chainguard | elasticsearch-9.4-iamguarded | 9.4.5-r3 |
| Chainguard | elasticsearch-9.4-iamguarded-fips | 9.4.5-r5 |
| Chainguard | elasticsearch-9.5 | 9.5.1-r3 |
| Chainguard | elasticsearch-9.5-iamguarded | 9.5.1-r3 |
| Chainguard | elasticsearch-9.5-iamguarded-fips | 9.5.2-r3 |
| Chainguard | elasticsearch-fips-9.1 | no fix |
| Chainguard | elasticsearch-fips-9.2 | no fix |
| Chainguard | elasticsearch-fips-9.3 | no fix |
| Chainguard | elasticsearch-fips-9.4 | 9.4.5-r5 |
| Chainguard | elasticsearch-fips-9.5 | 9.5.2-r3 |
| Chainguard | gremlin-server | 3.8.1-r2 |
| Chainguard | hadoop-3.5 | no fix |
| Chainguard | hadoop-fips-3.3.6 | no fix |
| Chainguard | hadoop-fips-3.4.2 | no fix |
| Chainguard | hadoop-fips-3.5 | 3.5.0-r3 |
| Chainguard | hadoop-fips-3.5 | no fix |
| Chainguard | hadoop-fips-3.5 | 3.5.0-r14 |
| Chainguard | kafbat-ui-fips | 1.5.0-r6 |
| Chainguard | kayenta-2025.4 | 2025.4.6-r11 |
| Chainguard | kayenta-fips-2025.2 | 2025.2.4-r7 |
| Chainguard | kayenta-fips-2025.4 | 2025.4.6-r6 |
| Chainguard | keycloak-26.5 | no fix |
| Chainguard | keycloak-26.5-iamguarded-compat | no fix |
| Chainguard | keycloak-26.5-operator | no fix |
| Chainguard | keycloak-26.6 | 26.6.4-r21 |
| Chainguard | keycloak-26.6-iamguarded-compat | 26.6.4-r21 |
| Chainguard | keycloak-26.6-operator | 26.6.4-r21 |
| Chainguard | keycloak-fips-26.5 | 26.5.7-r6 |
| Chainguard | keycloak-fips-26.5-iamguarded-fips | 26.5.7-r6 |
| Chainguard | keycloak-fips-26.5-operator | 26.5.7-r6 |
| Chainguard | keycloak-fips-26.6 | 26.6.4-r6 |
| Chainguard | keycloak-fips-26.6-iamguarded-fips | 26.6.4-r6 |
| Chainguard | keycloak-fips-26.6-operator | 26.6.4-r6 |
| Chainguard | knative-kafka-broker-1.20-dispatcher-loom | no fix |
| Chainguard | knative-kafka-broker-1.20-receiver-loom | no fix |
| Chainguard | knative-kafka-broker-fips-1.20-dispatcher-loom | no fix |
| Chainguard | knative-kafka-broker-fips-1.20-receiver-loom | no fix |
| Chainguard | kserve-modelmesh | 0.12.0-r38 |
| Chainguard | localstack | 4.14.0-r20 |
| Chainguard | metabase | 0.63.2-r3 |
| Chainguard | neo4j-2025.12 | 2025.12.1-r6 |
| Chainguard | neo4j-2026.01 | 2026.01.4-r6 |
| Chainguard | neo4j-2026.02 | 2026.02.3-r3 |
| Chainguard | opensearch-2-ml-commons | 2.19.6-r6 |
| Chainguard | opensearch-2-performance-analyzer | 2.19.6-r6 |
| Chainguard | opensearch-2-repository-azure | 2.19.6-r6 |
| Chainguard | opensearch-2-repository-s3 | 2.19.6-r6 |
| 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-security-analytics | 3.8.0-r2 |
| Chainguard | opensearch-fips-3-security-analytics | 3.8.0-r2 |
| Chainguard | ranger | no fix |
| Chainguard | seata-server | 2.7.0-r3 |
| Chainguard | sonarqube | 26.9.0.129388-r4 |
| Chainguard | spark-3.5-scala-2.12 | 3.5.9-r2 |
| Chainguard | spark-3.5-scala-2.13 | 3.5.9-r2 |
| Chainguard | spark-4.0-scala-2.13 | 4.0.4-r1 |
| Chainguard | spark-4.1-scala-2.13 | 4.1.3-r2 |
| Chainguard | spark-fips-3.5-scala-2.12 | 3.5.8-r6 |
| Chainguard | spark-fips-3.5-scala-2.13 | 3.5.8-r6 |
| Chainguard | spark-fips-4.1-scala-2.13 | 4.1.2-r6 |
| Chainguard | spark-fips-4.2-scala-2.13 | 4.2.0-r3 |
| Chainguard | spark-kubernetes-operator-fips | 1.0.0-r0 |
| Chainguard | strimzi-kafka-operator-cluster-operator | 1.2.0-r4 |
| Chainguard | strimzi-kafka-operator-kafka-init | no fix |
| Chainguard | strimzi-kafka-operator-topic-operator | 1.2.0-r4 |
| Chainguard | trino-plugin-opensearch | no fix |
| Chainguard | zaproxy | no fix |
| Chainguard | zipkin | 3.6.1-r19 |
| Chainguard | zipkin-slim | 3.6.1-r19 |
| Debian 12 | netty | no fix |
| Debian 13 | netty | no fix |
| Debian 14 | netty | no fix |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Module for Development Tools 15 SP7 | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | netty | 4.1.136-150200.4.53.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | netty-tcnative | 2.0.80-150200.3.48.1 |
| 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 | apache-pulsar-4.1 | 4.1.3-r15 |
| Wolfi | celeborn-0.6 | 0.6.3-r13 |
| Wolfi | celeborn-0.6 | no fix |
| Wolfi | druid | 37.0.0-r56 |
| Wolfi | druid | 37.0.0-r47 |
| Wolfi | druid | 37.0.0-r46 |
| Wolfi | keycloak-26.5 | no fix |
| Wolfi | keycloak-26.5-iamguarded-compat | no fix |
| Wolfi | keycloak-26.5-operator | no fix |
| Wolfi | keycloak-26.6 | 26.6.4-r21 |
| Wolfi | keycloak-26.6-iamguarded-compat | 26.6.4-r21 |
| Wolfi | keycloak-26.6-operator | 26.6.4-r21 |
| Wolfi | kserve-modelmesh | 0.12.0-r38 |
| Wolfi | neo4j-2025.12 | 2025.12.1-r6 |
| Wolfi | neo4j-2026.01 | 2026.01.4-r6 |
| 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-security-analytics | 3.8.0-r2 |
| Wolfi | sonarqube | 26.9.0.129388-r4 |
| Wolfi | spark-4.0-scala-2.13 | 4.0.4-r1 |
| Wolfi | spark-4.1-scala-2.13 | 4.1.3-r2 |
| Wolfi | strimzi-kafka-operator-cluster-operator | 1.2.0-r4 |
| Wolfi | strimzi-kafka-operator-kafka-init | no fix |
| Wolfi | strimzi-kafka-operator-topic-operator | 1.2.0-r4 |
| Wolfi | trino-plugin-opensearch | no fix |
| Wolfi | zipkin | 3.6.1-r19 |
| Wolfi | zipkin-slim | 3.6.1-r19 |
| openSUSE Tumbleweed | netty | 4.1.136-1.1 |