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Fencer Vulns
high 7.5

CVE-2026-45416 json

Netty: SNI handler pre-allocates up to 16 MiB from nine attacker bytes

published 2026-06-08 5 mo ago modified 2026-09-18 52 d ago also EUVD-2026-36436 , GHSA-x4gw-5cx5-pgmh

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, SslClientHelloHandler.decode() reads the 24-bit TLS handshake length and, when the ClientHello does not fit in the first record, eagerly allocates `ctx.alloc().buffer(handshakeLength)` (line 161). The guard at line 140 is `handshakeLength > maxClientHelloLength && maxClientHelloLength != 0`, and the commonly-used SniHandler/AbstractSniHandler constructors (SniHandler(Mapping), SniHandler(AsyncMapping), AbstractSniHandler()) pass maxClientHelloLength=0 and handshakeTimeoutMillis=0, so the length guard is disabled and no timeout is scheduled. A 16 MiB request exceeds the default pooled chunk size and becomes a huge/unpooled allocation performed immediately. The buffer is retained in the handler until the channel closes. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Patch / fix

  • maven io.netty:netty-handler 4.1.135.Final, 4.2.15.Final
  • Red Hat Cryostat 4 on RHEL 9 4.2.0-13
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 0:1.5.26-2.Final_redhat_00001.1.el7eap, 0:1.10.0-46.Final_redhat_00044.1.el7eap, 0:2.2.40-2.SP3_redhat_00001.1.el7eap, 0:2.3.14-11.SP11_redhat_00001.1.el7eap, 0:2.5.5-24.SP12_redhat_00016.1.el7eap, 0:2.5.5-30.SP12_redhat_00020.1.el7eap, 0:2.16.0-22.redhat_00057.1.el7eap, 0:2.18.8-1.redhat_00003.1.el7eap, 0:4.1.135-1.Final_redhat_00001.1.el7eap, 0:5.0.31-3.SP2_redhat_00001.1.el7eap, 0:7.4.25-2.GA_redhat_00001.1.el7eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8 0:1.5.26-2.Final_redhat_00001.1.el8eap, 0:1.10.0-46.Final_redhat_00044.1.el8eap, 0:2.2.40-1.SP3_redhat_00001.1.el8eap, 0:2.3.14-11.SP11_redhat_00001.1.el8eap, 0:2.5.5-24.SP12_redhat_00016.1.el8eap, 0:2.5.5-30.SP12_redhat_00020.1.el8eap, 0:2.16.0-22.redhat_00057.1.el8eap, 0:2.18.8-1.redhat_00003.1.el8eap, 0:4.1.135-1.Final_redhat_00001.1.el8eap, 0:5.0.31-3.SP2_redhat_00001.1.el8eap, 0:7.4.25-2.GA_redhat_00001.1.el8eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9 0:1.5.26-2.Final_redhat_00001.1.el9eap, 0:1.10.0-46.Final_redhat_00044.1.el9eap, 0:2.2.40-1.SP3_redhat_00001.1.el9eap, 0:2.3.14-11.SP11_redhat_00001.1.el9eap, 0:2.5.5-24.SP12_redhat_00016.1.el9eap, 0:2.5.5-30.SP12_redhat_00020.1.el9eap, 0:2.16.0-22.redhat_00057.1.el9eap, 0:2.18.8-1.redhat_00003.1.el9eap, 0:4.1.135-1.Final_redhat_00001.1.el9eap, 0:5.0.31-3.SP2_redhat_00001.1.el9eap, 0:7.4.25-2.GA_redhat_00001.1.el9eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA 4.1.135.Final-redhat-00001
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 0:4.1.135-1.Final_redhat_00001.1.el10eap, 0:8.1.7.1-1.GA_redhat_00004.1.el10eap, 0:801.7.1-1.GA_redhat_00001.1.el10eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 0:0.9.6-2.redhat_00002.1.el8eap, 0:4.1.135-1.Final_redhat_00001.1.el8eap, 0:8.1.7.1-1.GA_redhat_00004.1.el8eap, 0:801.7.1-1.GA_redhat_00001.1.el8eap
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 0:0.9.6-2.redhat_00002.1.el9eap, 0:4.1.135-1.Final_redhat_00001.1.el9eap, 0:8.1.7.1-1.GA_redhat_00004.1.el9eap, 0:801.7.1-1.GA_redhat_00001.1.el9eap
  • Red Hat Red Hat Offline Knowledge Portal 1.2.12 1782239370
  • Red Hat Red Hat OpenShift AI 2.25 1788198681
  • Red Hat Red Hat OpenShift Dev Spaces 3.30 1787759145, 1787759723
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el9sso
  • rh-sso7-keycloak red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak-server red hat single sign on 7.6 18.0.20-1.redhat_00001.1.el7sso
  • eap8-netty jboss enterprise application platform 8.1 4.1.135-1.Final_redhat_00001.1.el10eap
  • eap8-netty jboss enterprise application platform 8.1 4.1.135-1.Final_redhat_00001.1.el8eap

red hat advisories RHSA-2026:76129RHSA-2026:76130RHSA-2026:76128RHSA-2026:53645RHSA-2026:53646RHSA-2026:53644

  • netty-tcnative SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.0.79-150200.3.45.1
  • netty SLE Module for Package Hub 15 SP7 4.1.135-150200.4.50.1

suse advisories SUSE-SU-2026:2802-1

  • netty openSUSE Tumbleweed 4.1.135-1.1

opensuse advisories openSUSE-SU-2026:11033-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-45416 updated cvss 7.5

netty-handler: Netty: Denial of Service due to eager buffer allocation in TLS handshake

  • Red Hat OpenShift Serverless openshift-serverless-1/kn-ekb-receiver-rhel9, openshift-serverless-1/kn-ekb-dispatcher-rhel9, openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9, openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9, +4 more Red Hat build of Apache Camel - HawtIO 4 netty-handler Red Hat build of Apache Camel 4 for Quarkus 3 netty-handler Red Hat build of Apicurio Registry 3 netty-handler
    affected: workaround, no fix available
  • Red Hat build of Debezium 3 netty-handler
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Build of Keycloak netty-handler, rhbk-rhel9-operator, rhbk/keycloak-rhel9, rhbk-openshift-rhel9, rhbk/keycloak-rhel9-operator
    affected: workaround, no fix available
  • Red Hat Fuse 7 netty-handler Red Hat OpenShift AI (RHOAI) rhoai/odh-openvino-model-server-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat AMQ Clients 2026.Q3
    fixed: vendor fix RHSA-2026:69459
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-rhel9 4.2.0-13, cryostat/jfr-datasource-rhel9 4.2.0-13, cryostat/cryostat-reports-rhel9 4.2.0-13
    fixed: vendor fix RHSA-2026:48151
  • Red Hat Middleware Containers for OpenShift rh-sso-7/sso76-openshift-rhel8 7.6-85
    fixed: vendor fix RHSA-2026:76134
  • Red Hat AMQ Broker 7.13.6
    fixed: vendor fix RHSA-2026:66545
show 24 more
  • Red Hat AMQ Broker 7.14.1
    fixed: vendor fix RHSA-2026:66488
  • Red Hat Build of Apache Camel 3.33.2.SP1 netty-handler 4.1.135.Final-redhat-00001
    fixed: vendor fix RHSA-2026:26586
  • Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:37390
  • Red Hat build of Keycloak 26.4.13
    fixed: vendor fix RHSA-2026:30049
  • Red Hat build of Keycloak 26.6.4
    fixed: vendor fix RHSA-2026:30083
  • Red Hat build of Quarkus 3.27.4.SP1 netty-handler 4.1.135.Final-redhat-00001
    fixed: vendor fix RHSA-2026:26018
  • Red Hat build of Quarkus 3.33.2.SP1 netty-handler 4.1.135.Final-redhat-00001
    fixed: vendor fix RHSA-2026:26017
  • Red Hat Data Grid 8.6.2
    fixed: vendor fix RHSA-2026:41951
  • Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server eap7-wildfly 7.4.25-2.GA_redhat_00001.1.el7eap, eap7-jackson-core 2.18.8-1.redhat_00003.1.el7eap, eap7-netty 4.1.135-1.Final_redhat_00001.1.el7eap, eap7-undertow 2.2.40-2.SP3_redhat_00001.1.el7eap, eap7-jackson-databind 2.18.8-1.redhat_00003.1.el7eap, eap7-netty-all 4.1.135-1.Final_redhat_00001.1.el7eap, +78 more
    fixed: vendor fix RHSA-2026:53644
  • Red Hat JBoss EAP 8.1 for RHEL 8 eap8-jose4j 0.9.6-2.redhat_00002.1.el8eap, eap8-wildfly 8.1.7.1-1.GA_redhat_00004.1.el8eap, eap8-netty 4.1.135-1.Final_redhat_00001.1.el8eap, eap8-netty-codec 4.1.135-1.Final_redhat_00001.1.el8eap, eap8-netty-buffer 4.1.135-1.Final_redhat_00001.1.el8eap, eap8-netty-common 4.1.135-1.Final_redhat_00001.1.el8eap, +16 more Red Hat JBoss EAP 8.1 for RHEL 9 eap8-jose4j 0.9.6-2.redhat_00002.1.el9eap, eap8-wildfly 8.1.7.1-1.GA_redhat_00004.1.el9eap, eap8-netty 4.1.135-1.Final_redhat_00001.1.el9eap, eap8-netty-codec 4.1.135-1.Final_redhat_00001.1.el9eap, eap8-netty-buffer 4.1.135-1.Final_redhat_00001.1.el9eap, eap8-netty-common 4.1.135-1.Final_redhat_00001.1.el9eap, +16 more Red Hat JBoss EAP 8.1 for RHEL 10 eap8-wildfly 8.1.7.1-1.GA_redhat_00004.1.el10eap, eap8-netty 4.1.135-1.Final_redhat_00001.1.el10eap, eap8-netty-codec 4.1.135-1.Final_redhat_00001.1.el10eap, eap8-netty-buffer 4.1.135-1.Final_redhat_00001.1.el10eap, eap8-netty-common 4.1.135-1.Final_redhat_00001.1.el10eap, eap8-wildfly-modules 8.1.7.1-1.GA_redhat_00004.1.el10eap, +14 more
    fixed: vendor fix RHSA-2026:49700
  • Red Hat JBoss Enterprise Application Platform 7.4.25
    fixed: vendor fix RHSA-2026:53806
  • Red Hat JBoss Enterprise Application Platform 8.1.7.GA netty-handler 4.1.135.Final-redhat-00001
    fixed: vendor fix RHSA-2026:49701
  • Red Hat Offline Knowledge Portal 1.2.13 offline-knowledge-portal/rhokp-rhel9 1782239370
    fixed: vendor fix RHSA-2026:28573
  • Red Hat OpenShift AI 2.25 rhoai/odh-trustyai-service-rhel9 1788198681
    fixed: vendor fix RHSA-2026:65126
  • Red Hat OpenShift AI 3.4 rhoai/odh-trustyai-service-rhel9 1791792525
    fixed: vendor fix RHSA-2026:84734
  • Red Hat OpenShift Dev Spaces 3.30 devspaces/openvsx-rhel9 1787759145, devspaces/pluginregistry-rhel9 1787759723
    fixed: vendor fix RHSA-2026:62260
  • Red Hat OpenShift Dev Spaces 3.31 devspaces/jetbrains-ide-rhel9 1792476427
    fixed: vendor fix RHSA-2026:90321
  • Red Hat Single Sign-On 7.6 for RHEL 7 Server rh-sso7-keycloak 18.0.20-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server 18.0.20-1.redhat_00001.1.el7sso
    fixed: vendor fix RHSA-2026:76128
  • Red Hat Single Sign-On 7.6 for RHEL 8 rh-sso7-keycloak 18.0.20-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server 18.0.20-1.redhat_00001.1.el8sso
    fixed: vendor fix RHSA-2026:76129
  • Red Hat Single Sign-On 7.6 for RHEL 9 rh-sso7-keycloak 18.0.20-1.redhat_00001.1.el9sso, rh-sso7-keycloak-server 18.0.20-1.redhat_00001.1.el9sso
    fixed: vendor fix RHSA-2026:76130
  • Red Hat Single Sign-On 7.6.13
    fixed: vendor fix RHSA-2026:76132
  • Red Hat Streams for Apache Kafka 2.9.4
    fixed: vendor fix RHSA-2026:34608
  • Red Hat Streams for Apache Kafka 3.2.1
    fixed: vendor fix RHSA-2026:54435
  • Red Hat Cryostat 4 on RHEL 9 cryostat/cryostat-db-rhel9 4.2.0-19, cryostat/cryostat-storage-rhel9 4.2.0-19, cryostat/cryostat-rhel9-operator 4.2.0-18, cryostat/cryostat-operator-bundle 4.2.0-11, cryostat/cryostat-agent-init-rhel9 0.7.0-11, cryostat/cryostat-grafana-dashboard-rhel9 4.2.0-13, +1 more Red Hat Build of Apache Camel 3.33.2.SP1 jimfs 1.1, jna 5.8.0, bcel 6.7.0, bson 5.6.4, gax 2.74.1, icu4j 78.2, +1630 more Red Hat build of Quarkus 3.27.4.SP1 jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more
    not affected: vulnerable code not present

11 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.92% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven io.netty:netty-handler
>=4.2.0.Final, <4.2.15.Final
<4.1.135.Final
4.2.15.Final
4.1.135.Final

Affected products

  • netty netty
  • Red Hat Cryostat 4 on RHEL 9
  • Red Hat Red Hat AMQ Broker 7.13.6
  • Red Hat Red Hat AMQ Broker 7.14.1
  • Red Hat Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1
  • Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
  • Red Hat Red Hat build of Quarkus 3.27.4.SP1
  • Red Hat Red Hat build of Quarkus 3.33.2.SP1
  • Red Hat Red Hat Data Grid 8.6.2
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
  • Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
  • Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
  • Red Hat Streams for Apache Kafka 2.9.4
  • Red Hat Streams for Apache Kafka 3.2.1
  • Red Hat Red Hat Offline Knowledge Portal 1.2.12
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift Dev Spaces 3.30
  • Red Hat OpenShift Serverless
  • Red Hat Red Hat AMQ Clients
  • Red Hat Red Hat build of Apache Camel 4 for Quarkus 3
  • Red Hat Red Hat build of Apache Camel - HawtIO 4
  • Red Hat Red Hat build of Apicurio Registry 3
  • Red Hat Red Hat build of Debezium 3
  • Red Hat Red Hat Build of Keycloak
  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Red Hat Fuse 7
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Dev Spaces
  • Red Hat Red Hat Satellite 6
  • Red Hat Red Hat Single Sign-On 7

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.