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OpenAdvisories
Medium · 6.5 CVE-2026-42580 EUVD-2026-30123GHSA-m4cv-j2px-7723

Netty: HTTP Request Smuggling due to incorrect chunk size parsing

Published May 13, 2026 · Updated May 14, 2026 · Assigned by GitHub_M

Vendor: io.netty Vendor: netty Product: netty Product: netty-codec-http Package: akhq Package: apache-activemq-artemis Package: apache-nifi Package: apache-nifi-registry Package: apache-pulsar-4.2 Package: apicurio-registry Package: celeborn-0.6 Package: docker-selenium-base Package: druid Package: flyway Package: infinispan-16.1 Package: io.netty:netty-codec-http Package: keycloak-26.4-iamguarded-compat Package: keycloak-26.5 Package: keycloak-26.5-iamguarded-compat Package: keycloak-26.5-operator Package: keycloak-26.6 Package: keycloak-26.6-iamguarded-compat Package: keycloak-26.6-operator Package: kserve-modelmesh Package: logstash-9.3 Package: logstash-9.3-iamguarded-compat Package: logstash-9.3-with-output-opensearch Package: management-api-for-apache-cassandra-5.0 Package: neo4j-2025.10 Package: neo4j-2026.01 Package: netty Package: netty Package: opensearch-2 Package: opensearch-3 Package: opensearch-3-discovery-ec2 Package: opensearch-3-iamguarded-compat Package: opensearch-3-ml-commons Package: opensearch-3-neural-search Package: opensearch-3-notifications Package: opensearch-3-performance-analyzer Package: opensearch-3-repository-azure Package: opensearch-3-repository-s3 Package: opensearch-3-security Package: opensearch-3-security-analytics Package: selenium-server Package: sonarqube Package: spark-4.0-scala-2.13 Package: spark-4.1-scala-2.13 Package: strimzi-kafka-operator-cluster-operator Package: strimzi-kafka-operator-kafka-agent Package: strimzi-kafka-operator-kafka-init Package: strimzi-kafka-operator-kafka-thirdparty-libs-cc Package: strimzi-kafka-operator-topic-operator Package: strimzi-kafka-operator-tracing-agent Package: strimzi-kafka-operator-user-operator Package: tez Package: thingsboard-tb-mqtt-transport Package: thingsboard-tb-node Package: trino-plugin-delta-lake Package: trino-plugin-elasticsearch Package: trino-plugin-exchange-filesystem Package: trino-plugin-exchange-hdfs Package: trino-plugin-hive Package: trino-plugin-hudi Package: trino-plugin-iceberg Package: trino-plugin-lakehouse Package: trino-plugin-opensearch Package: trino-plugin-pinot Package: trino-plugin-redshift Package: trino-plugin-spooling-filesystem Package: trino-plugin-thrift Package: wavefront-proxy Package: zipkin Package: zipkin-slim Ecosystem: Debian Ecosystem: Maven Ecosystem: Ubuntu Ecosystem: Wolfi

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Affected products

VendorProductAffectedFixed
netty netty >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.Final —
io.netty netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.Final —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 netty No fix yet —
Debian 13 netty No fix yet —
Debian 12 netty No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.10 netty No fix yet —
Ubuntu 25.10 netty No fix yet —
Show 7 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 26.04 LTS netty No fix yet —
Ubuntu Pro 24.04 LTS netty No fix yet —
Ubuntu Pro 22.04 LTS netty No fix yet —
Ubuntu Pro 20.04 LTS netty No fix yet —
Ubuntu Pro 18.04 LTS netty No fix yet —
Ubuntu Pro 16.04 LTS netty No fix yet —
Ubuntu Pro 14.04 LTS netty No fix yet —

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP7 netty 4.1.133-150200.4.46.1 SUSE-SU-2026:2308-1
SLES 15 SP7 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1
SLES 15 SP6 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1
SLES 15 SP5 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1
SLES 15 SP4 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1
Show 5 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 15 SP6 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1
SLES for SAP 15 SP5 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1
SLES for SAP 15 SP4 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1
SLE HPC 15 SP5 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1
SLE HPC 15 SP4 netty-tcnative 2.0.77-150200.3.39.1 SUSE-SU-2026:2308-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed netty 4.1.133-1.1 openSUSE-SU-2026:10795-1

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling akhq 0.27.1-r1 —
Wolfi rolling apache-activemq-artemis 2.54.0-r1 —
Wolfi rolling apache-nifi 2.9.0-r6 —
Wolfi rolling apache-nifi-registry 2.9.0-r8 —
Wolfi rolling apache-pulsar-4.2 4.2.1-r2 —
Wolfi rolling apicurio-registry 3.2.1-r3 —
Wolfi rolling celeborn-0.6 0.6.3-r3 —
Wolfi rolling docker-selenium-base 4.43.0.20260404-r2 —
Wolfi rolling druid 37.0.0-r1 —
Wolfi rolling flyway 12.6.1-r0 —
Wolfi rolling infinispan-16.1 16.1.3-r2 —
Wolfi rolling keycloak-26.5 +5 No fix yet —
Wolfi rolling keycloak-26.6 +2 26.6.1-r2 —
Wolfi rolling kserve-modelmesh 0.12.0-r33 —
Wolfi rolling logstash-9.3 +1 9.3.4-r4 —
Wolfi rolling management-api-for-apache-cassandra-5.0 0.1.117-r1 —
Wolfi rolling neo4j-2026.01 2026.01.4-r1 —
Wolfi rolling opensearch-2 2.19.4-r14 —
Wolfi rolling opensearch-3 +6 3.6.0-r5 —
Wolfi rolling opensearch-3-discovery-ec2 +2 3.8.0-r3 —
Wolfi rolling opensearch-3-security-analytics 3.7.0-r0 —
Wolfi rolling selenium-server 4.44.0-r0 —
Wolfi rolling sonarqube 26.7.0.124771-r0 —
Wolfi rolling spark-4.0-scala-2.13 4.0.2-r12 —
Wolfi rolling spark-4.1-scala-2.13 4.1.2-r0 —
Wolfi rolling strimzi-kafka-operator-kafka-init +6 0.51.0-r25 —
Wolfi rolling tez 0.10.5-r12 —
Wolfi rolling thingsboard-tb-node +1 4.3.1.1-r5 —
Wolfi rolling trino-plugin-hive +12 481-r0 —
Wolfi rolling wavefront-proxy 13.9-r13 —
Wolfi rolling zipkin +1 3.6.1-r6 —

Affected packages

EcosystemPackageAffectedFixedRecord
Maven io.netty:netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final 4.2.13.Final GHSA-m4cv-j2px-7723
Maven io.netty:netty-codec-http < 4.1.133.Final 4.1.133.Final GHSA-m4cv-j2px-7723

Advisories 3

References