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TI-2026-51618 Aliases CVE-2026-73508GHSA-mfg7-5gfp-c4w3

Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names

Priority MEDIUM 40CWE-772Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 11 fixed, 9 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-772.

Summary

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns.AbstractDnsRecord, io.netty.handler.codec.dns.DefaultDnsRecordDecoder.decodeRecord(), and io.netty.handler.codec.dns.DnsCodecUtil.decompressDomainName() failed to release retained or newly allocated ByteBuf objects when IDN.toASCII() or encodeDomainName() rejected a malformed domain name, allowing unauthenticated remote DNS packets to leak direct memory incrementally until denial of service. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0063 50th percentileScored 2026-11-07
Fix Partial netty (netty): 4.1.136.Final, 4.2.16.Finalio.netty:netty-codec-dns (Maven): 4.2.16.Final, 4.1.136.FinalRed Hat: 11 advisoriesRed Hat: 11 fixed, 9 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
nettynettybefore 4.1.136.Final; 4.2.0.Final to before 4.2.16.Final4.1.136.Final, 4.2.16.FinalPatch availableCNA
—io.netty:netty-codec-dns (Maven)4.2.0.Final to before 4.2.16.Final4.2.16.FinalPatch availableGHSA-mfg7-5gfp-c4w3
—io.netty:netty-codec-dns (Maven)before 4.1.136.Final4.1.136.FinalPatch availableGHSA-mfg7-5gfp-c4w3
  • netty Vendornetty Affected before 4.1.136.Final; 4.2.0.Final to before 4.2.16.Final Fixed in 4.1.136.Final, 4.2.16.Final Patch available CNA
  • io.netty:netty-codec-dns (Maven) Vendor— Affected 4.2.0.Final to before 4.2.16.Final Fixed in 4.2.16.Final Patch available GHSA-mfg7-5gfp-c4w3
  • io.netty:netty-codec-dns (Maven) Vendor— Affected before 4.1.136.Final Fixed in 4.1.136.Final Patch available GHSA-mfg7-5gfp-c4w3

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*before 4.1.136; 4.2.0 to before 4.2.16Vulnerablenetty
  • cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* Versions before 4.1.136; 4.2.0 to before 4.2.16 Vulnerable ·netty

Remediation

  • Fix · CNA netty (netty) Fixed in 4.1.136.Final, 4.2.16.Final
  • Fix · GHSA-mfg7-5gfp-c4w3 io.netty:netty-codec-dns (Maven) Fixed in 4.2.16.Final Advisory →
  • Fix · GHSA-mfg7-5gfp-c4w3 io.netty:netty-codec-dns (Maven) Fixed in 4.1.136.Final Advisory →

Red Hat 11 advisories

  • RHSA-2026:90321 Released 2026-10-26 · Red Hat rating Critical
    Red Hat OpenShift Dev Spaces 3.31.0 Release.
    • Red Hat OpenShift Dev Spaces 3.31 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/dashboard-rhel9, registry.redhat.io/devspaces/jetbrains-ide-rhel9 +8
  • RHSA-2026:87410 Released 2026-10-21 · Red Hat rating Critical
    RHOAI 2.25.12 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 2.25 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-caikit-nlp-rhel9, registry.redhat.io/rhoai/odh-codeflare-operator-rhel9 +47
  • RHSA-2026:86891 Released 2026-10-21 · Red Hat rating Critical
    RHOAI 3.5.2 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.5 registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-cli-rhel9 +47
Show 8 more Red Hat advisories
  • RHSA-2026:84734 Released 2026-10-19 · Red Hat rating Critical
    RHOAI 3.4.5 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-ai-gateway-payload-processing-rhel9, registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-autorag-rhel9 +47
  • RHSA-2026:83612 Released 2026-10-15 · Red Hat rating Important
    Red Hat build of Debezium 3.6.3 release
    • Red Hat Build of Debezium 3.6
  • RHSA-2026:70277 Released 2026-09-22 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 8.1.8 security update
    • Red Hat JBoss Enterprise Application Platform 8.1.8.GA com.fasterxml.jackson.core.jackson-core-2.18.9.redhat-00003.jar, com.fasterxml.jackson.core.jackson-databind-2.18.9.redhat-00003.jar, io.netty.netty-codec-4.1.136.Final-redhat-00001.jar +17
  • RHSA-2026:70230 Released 2026-09-22 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 8.1.8 security update
    • Red Hat JBoss EAP 8.1 for RHEL 10 eap8-activemq-artemis-2.40.0-8.redhat_00024.1.el10eap, eap8-activemq-artemis-cli-2.40.0-8.redhat_00024.1.el10eap, eap8-activemq-artemis-commons-2.40.0-8.redhat_00024.1.el10eap +47
  • RHSA-2026:70228 Released 2026-09-22 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 8.1.8 security update
    • Red Hat JBoss EAP 8.1 for RHEL 8 eap8-activemq-artemis-2.40.0-8.redhat_00024.1.el8eap, eap8-activemq-artemis-cli-2.40.0-8.redhat_00024.1.el8eap, eap8-activemq-artemis-commons-2.40.0-8.redhat_00024.1.el8eap +47
  • RHSA-2026:70229 Released 2026-09-22 · Red Hat rating Important
    Red Hat JBoss Enterprise Application Platform 8.1.8 security update
    • Red Hat JBoss EAP 8.1 for RHEL 9 eap8-activemq-artemis-2.40.0-8.redhat_00024.1.el9eap, eap8-activemq-artemis-cli-2.40.0-8.redhat_00024.1.el9eap, eap8-activemq-artemis-commons-2.40.0-8.redhat_00024.1.el9eap +47
  • RHSA-2026:69296 Released 2026-09-21 · Red Hat rating Important
    Red Hat Data Grid 8.6.3 security update
    • Red Hat Data Grid 8.6.3
  • RHSA-2026:68754 Released 2026-09-17 · Red Hat rating Important
    Red Hat OpenShift Dev Spaces 3.30.1 Release.
    • Red Hat OpenShift Dev Spaces 3.30 registry.redhat.io/devspaces/code-rhel9, registry.redhat.io/devspaces/dashboard-rhel9, registry.redhat.io/devspaces/openvsx-rhel9 +2

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix yet
OpenShift ServerlessAffectedNo fix yet
Red Hat Build of KeycloakAffectedNo fix yet
Red Hat Data Grid 8AffectedNo fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet
Red Hat JBoss Enterprise Application Platform 7AffectedNo fix planned: Will not fix
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet
Red Hat Single Sign-On 7AffectedNo fix planned: Will not fix
Red Hat build of Apicurio Registry 3AffectedNo fix yet
Red Hat Build of Debezium 3.6Fixed RHSA-2026:83612
Red Hat Data Grid 8.6.3Fixed RHSA-2026:69296
Red Hat JBoss EAP 8.1 for RHEL 10Fixed RHSA-2026:70230
Red Hat JBoss EAP 8.1 for RHEL 8Fixed RHSA-2026:70228
Red Hat JBoss EAP 8.1 for RHEL 9Fixed RHSA-2026:70229
Red Hat JBoss Enterprise Application Platform 8.1.8.GAFixed RHSA-2026:70277
Red Hat OpenShift AI 2.25Fixed RHSA-2026:87410
Red Hat OpenShift AI 3.4Fixed RHSA-2026:84734
Red Hat OpenShift AI 3.5Fixed RHSA-2026:86891
Red Hat OpenShift Dev Spaces 3.30Fixed RHSA-2026:68754
Red Hat OpenShift Dev Spaces 3.31Fixed RHSA-2026:90321
Not affected: 13 products
  • Red Hat Build of Keycloak
  • Red Hat Fuse 7
  • Red Hat JBoss Enterprise Application Platform 8.1.8.GA
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat OpenShift AI 2.25
  • Red Hat OpenShift AI 3.4
  • Red Hat OpenShift AI 3.5
  • Red Hat OpenShift Dev Spaces 3.30
  • Red Hat OpenShift Dev Spaces 3.31
  • Red Hat build of Apache Camel 4 for Quarkus 3
  • Red Hat build of Apache Camel for Spring Boot 4
  • Red Hat build of Quarkus

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73508
  2. 2026-10-03 Alias added: GHSA-mfg7-5gfp-c4w3
  3. 2026-10-09 Fix available: RHSA-2026:70277 · Red Hat
  4. 2026-10-09 Fix available: Red Hat JBoss Enterprise Application Platform 8.1 · Red Hat
  5. 2026-10-16 Fix available: RHSA-2026:83612 · Red Hat
  6. 2026-10-16 Fix available: Red Hat Build of Debezium 3.6 · Red Hat
  7. 2026-10-20 Fix available: RHSA-2026:84734 · Red Hat
  8. 2026-10-20 Fix available: Red Hat OpenShift AI 3.4 · Red Hat
  9. 2026-10-21 Fix available: Red Hat JBoss Enterprise Application Platform 8.1.8.GA · Red Hat
  10. 2026-10-22 Fix available: RHSA-2026:86891 · Red Hat
  11. 2026-10-22 Fix available: RHSA-2026:87410 · Red Hat
  12. 2026-10-23 Fix available: Red Hat OpenShift AI 2.25, Red Hat OpenShift AI 3.5 · Red Hat
  13. 2026-10-25 Priority changed: LOW → MEDIUM
  14. 2026-10-28 EPSS moved to the 50th–90th percentile
  15. 2026-10-29 Fix available: Red Hat OpenShift Dev Spaces 3.31 · Red Hat
  16. 2026-10-30 Fix available: RHSA-2026:90321 · Red Hat

References

Patch 2

Advisory 1

Other 5

  • 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