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TI-2026-30865 Aliases CVE-2026-42585GHSA-38f8-5428-x5cv

Netty: HTTP Request Smuggling due to malformed Transfer-Encoding

Priority HIGH 72CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 8 fixed, 21 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00267 18th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial netty (netty): 4.2.13.Final, 4.1.133.Finalnetty-codec-http (io.netty): 4.2.13.Final, 4.1.133.Final+1 more productRed Hat: 8 advisoriesRed Hat: 8 fixed, 21 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nettynetty4.2.0.Alpha1 to before 4.2.13.Final; before 4.1.133.Final4.2.13.Final, 4.1.133.FinalPatch availableCNA
nettynetty-codec-http4.2.0.Alpha1 to before 4.2.13.Final; before 4.1.133.Final4.2.13.Final, 4.1.133.FinalPatch availableCNA
—io.netty:netty-codec-http (Maven)4.2.0.Alpha1 to before 4.2.13.Final4.2.13.FinalPatch availableGHSA-38f8-5428-x5cv
—io.netty:netty-codec-http (Maven)before 4.1.133.Final4.1.133.FinalPatch availableGHSA-38f8-5428-x5cv
  • netty Vendornetty Affected 4.2.0.Alpha1 to before 4.2.13.Final; before 4.1.133.Final Fixed in 4.2.13.Final, 4.1.133.Final Patch available CNA
  • netty-codec-http Vendornetty Affected 4.2.0.Alpha1 to before 4.2.13.Final; before 4.1.133.Final Fixed in 4.2.13.Final, 4.1.133.Final Patch available CNA
  • io.netty:netty-codec-http (Maven) Vendor— Affected 4.2.0.Alpha1 to before 4.2.13.Final Fixed in 4.2.13.Final Patch available GHSA-38f8-5428-x5cv
  • io.netty:netty-codec-http (Maven) Vendor— Affected before 4.1.133.Final Fixed in 4.1.133.Final Patch available GHSA-38f8-5428-x5cv

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*before 4.1.133; 4.2.0 to before 4.2.13Vulnerablenetty
  • cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* Versions before 4.1.133; 4.2.0 to before 4.2.13 Vulnerable ·netty

Remediation

  • Fix · CNA netty (netty) Fixed in 4.2.13.Final, 4.1.133.Final
  • Fix · CNA netty-codec-http (io.netty) Fixed in 4.2.13.Final, 4.1.133.Final
  • Fix · GHSA-38f8-5428-x5cv io.netty:netty-codec-http (Maven) Fixed in 4.2.13.Final Advisory →
  • Fix · GHSA-38f8-5428-x5cv io.netty:netty-codec-http (Maven) Fixed in 4.1.133.Final Advisory →

Red Hat 8 advisories

  • RHSA-2026:73976 Released 2026-09-30 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 7.1.16 security update
    • Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 Server eap7-hibernate-5.1.17-5.Final_redhat_00006.1.ep7.el7, eap7-hibernate-core-5.1.17-5.Final_redhat_00006.1.ep7.el7, eap7-hibernate-entitymanager-5.1.17-5.Final_redhat_00006.1.ep7.el7 +7
  • RHSA-2026:73644 Released 2026-09-30 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 7.3.19 Update
    • Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 Server eap7-hibernate-5.3.39-1.Final_redhat_00001.1.el7eap, eap7-hibernate-core-5.3.39-1.Final_redhat_00001.1.el7eap, eap7-hibernate-entitymanager-5.3.39-1.Final_redhat_00001.1.el7eap +31
  • RHSA-2026:53806 Released 2026-08-11 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 7.4.25 security update
    • Red Hat JBoss Enterprise Application Platform 7.4.25
Show 5 more Red Hat advisories
  • RHSA-2026:53646 Released 2026-08-11 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 7.4.25 Security update
    • Red Hat JBoss EAP 7.4 ELS for RHEL 9 eap7-activemq-artemis-2.16.0-22.redhat_00057.1.el9eap, eap7-activemq-artemis-cli-2.16.0-22.redhat_00057.1.el9eap, eap7-activemq-artemis-commons-2.16.0-22.redhat_00057.1.el9eap +47
  • RHSA-2026:53645 Released 2026-08-11 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 7.4.25 Security update
    • Red Hat JBoss EAP 7.4 ELS for RHEL 8 eap7-activemq-artemis-2.16.0-22.redhat_00057.1.el8eap, eap7-activemq-artemis-cli-2.16.0-22.redhat_00057.1.el8eap, eap7-activemq-artemis-commons-2.16.0-22.redhat_00057.1.el8eap +47
  • RHSA-2026:53644 Released 2026-08-11 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 7.4.25 security pdate
    • Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server eap7-activemq-artemis-2.16.0-22.redhat_00057.1.el7eap, eap7-activemq-artemis-cli-2.16.0-22.redhat_00057.1.el7eap, eap7-activemq-artemis-commons-2.16.0-22.redhat_00057.1.el7eap +47
  • RHSA-2026:49700 Released 2026-08-03 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 8.1.7 security update
    • Red Hat JBoss EAP 8.1 for RHEL 10 eap8-eap-product-conf-parent-801.7.1-1.GA_redhat_00001.1.el10eap, eap8-eap-product-conf-wildfly-ee-feature-pack-801.7.1-1.GA_redhat_00001.1.el10eap, eap8-netty-4.1.135-1.Final_redhat_00001.1.el10eap +17
    • Red Hat JBoss EAP 8.1 for RHEL 8 eap8-eap-product-conf-parent-801.7.1-1.GA_redhat_00001.1.el8eap, eap8-eap-product-conf-wildfly-ee-feature-pack-801.7.1-1.GA_redhat_00001.1.el8eap, eap8-jose4j-0.9.6-2.redhat_00002.1.el8eap +19
    • Red Hat JBoss EAP 8.1 for RHEL 9 eap8-eap-product-conf-parent-801.7.1-1.GA_redhat_00001.1.el9eap, eap8-eap-product-conf-wildfly-ee-feature-pack-801.7.1-1.GA_redhat_00001.1.el9eap, eap8-jose4j-0.9.6-2.redhat_00002.1.el9eap +19
  • RHSA-2026:49701 Released 2026-08-03 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 8.1.7 security update
    • Red Hat JBoss Enterprise Application Platform 8.1.7.GA io.netty.netty-codec-dns-4.1.135.Final-redhat-00001.jar, io.netty.netty-codec-http-4.1.135.Final-redhat-00001.jar, io.netty.netty-handler-4.1.135.Final-redhat-00001.jar +2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Cryostat 4AffectedNo fix yet: Fix deferred
OpenShift ServerlessAffectedNo fix yet: Fix deferred
Red Hat AMQ Broker 7AffectedNo fix yet: Fix deferred
Red Hat AMQ ClientsAffectedNo fix yet: Fix deferred
Red Hat Build of KeycloakAffectedNo fix yet: Fix deferred
Red Hat Data Grid 8AffectedNo fix yet: Fix deferred
Red Hat Fuse 7AffectedNo fix yet: Fix deferred
Red Hat JBoss Enterprise Application Platform Expansion PackAffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat OpenShift Dev SpacesAffectedNo fix yet: Fix deferred
Red Hat Process Automation 7AffectedNo fix yet: Fix deferred
Red Hat Single Sign-On 7AffectedNo fix yet: Fix deferred
Red Hat build of Apache Camel 4 for Quarkus 3AffectedNo fix yet: Fix deferred
Red Hat build of Apache Camel for Spring Boot 4AffectedNo fix yet: Fix deferred
Red Hat build of Apicurio Registry 2AffectedNo fix yet: Fix deferred
Red Hat build of Apicurio Registry 3AffectedNo fix yet: Fix deferred
Red Hat build of Debezium 3AffectedNo fix yet: Fix deferred
Red Hat build of OptaPlanner 8AffectedNo fix yet: Fix deferred
Red Hat build of QuarkusAffectedNo fix yet: Fix deferred
streams for Apache Kafka 2AffectedNo fix yet: Fix deferred
streams for Apache Kafka 3AffectedNo fix yet: Fix deferred
Red Hat JBoss EAP 7.4 ELS for RHEL 7 ServerFixed RHSA-2026:53644
Red Hat JBoss EAP 8.1 for RHEL 10Fixed RHSA-2026:49700
Red Hat JBoss EAP 8.1 for RHEL 8Fixed RHSA-2026:49700
Red Hat JBoss EAP 8.1 for RHEL 9Fixed RHSA-2026:49700
Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 ServerFixed RHSA-2026:73976
Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 ServerFixed RHSA-2026:73644
Red Hat JBoss Enterprise Application Platform 7.4.25Fixed RHSA-2026:53806
Red Hat JBoss Enterprise Application Platform 8.1.7.GAFixed RHSA-2026:49701
Not affected: 3 products
  • Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat JBoss Enterprise Application Platform 8.1.7.GA
  • Red Hat Satellite 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42585
  2. 2026-10-03 Alias added: GHSA-38f8-5428-x5cv
  3. 2026-10-21 Affected versions changed · Red Hat
  4. 2026-11-01 Affected versions changed · Red Hat

References

Exploit 1

Advisory 1

Other 2

  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2026-30861 Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization CVSS 3.1CRITICAL 9.8
  • TI-2026-30864 Netty: HttpClientCodec response desynchronization CVSS 3.1CRITICAL 9.1
  • TI-2026-30859 Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder) CVSS 3.1CRITICAL 9.1
  • TI-2026-40973 Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks CVSS 3.1CRITICAL 9.1
  • TI-2026-40972 Uncontrolled resource consumption in netty CVSS 3.1HIGH 7.5
See all 92 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences