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TI-2026-33415 Aliases CVE-2026-45673GHSA-xmv7-r254-6q78

Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port

Priority LOW 30CWE-330Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 2 fixed, 19 without a fix

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

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, Netty's DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0032 25th percentileScored 2026-11-07
Fix Partial netty (netty): 4.2.15.Final, 4.1.135.Finalio.netty:netty-resolver-dns (Maven): 4.2.15.Final, 4.1.135.FinalRed Hat: 2 advisoriesRed Hat: 2 fixed, 19 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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.Final to before 4.2.15.Final; before 4.1.135.Final4.2.15.Final, 4.1.135.FinalPatch availableCNA
—io.netty:netty-resolver-dns (Maven)4.2.0.Final to before 4.2.15.Final4.2.15.FinalPatch availableGHSA-xmv7-r254-6q78
—io.netty:netty-resolver-dns (Maven)before 4.1.135.Final4.1.135.FinalPatch availableGHSA-xmv7-r254-6q78
  • netty Vendornetty Affected 4.2.0.Final to before 4.2.15.Final; before 4.1.135.Final Fixed in 4.2.15.Final, 4.1.135.Final Patch available CNA
  • io.netty:netty-resolver-dns (Maven) Vendor— Affected 4.2.0.Final to before 4.2.15.Final Fixed in 4.2.15.Final Patch available GHSA-xmv7-r254-6q78
  • io.netty:netty-resolver-dns (Maven) Vendor— Affected before 4.1.135.Final Fixed in 4.1.135.Final Patch available GHSA-xmv7-r254-6q78

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*before 4.1.135; 4.2.0 to before 4.2.15Vulnerablenetty
  • cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* Versions before 4.1.135; 4.2.0 to before 4.2.15 Vulnerable ·netty

Remediation

  • Fix · CNA netty (netty) Fixed in 4.2.15.Final, 4.1.135.Final
  • Fix · GHSA-xmv7-r254-6q78 io.netty:netty-resolver-dns (Maven) Fixed in 4.2.15.Final Advisory →
  • Fix · GHSA-xmv7-r254-6q78 io.netty:netty-resolver-dns (Maven) Fixed in 4.1.135.Final Advisory →

Red Hat 2 advisories

  • RHSA-2026:26018 Released 2026-06-17 · Red Hat rating Important
    Red Hat build of Quarkus 3.27.4.SP1 security update
    • Red Hat build of Quarkus 3.27.4.SP1 io.netty.netty-codec-haproxy-4.1.135.Final-redhat-00001.jar, io.netty.netty-codec-http-4.1.135.Final-redhat-00001.jar, io.netty.netty-codec-http2-4.1.135.Final-redhat-00001.jar +4
  • RHSA-2026:26017 Released 2026-06-17 · Red Hat rating Important
    Red Hat build of Quarkus 3.33.2.SP1 security update
    • Red Hat build of Quarkus 3.33.2.SP1 io.netty.netty-codec-haproxy-4.1.135.Final-redhat-00001.jar, io.netty.netty-codec-http-4.1.135.Final-redhat-00001.jar, io.netty.netty-codec-http2-4.1.135.Final-redhat-00001.jar +4

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 Build of KeycloakAffectedNo fix yet: Fix deferred
Red Hat Data Grid 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet: Fix deferred
Red Hat Fuse 7AffectedNo fix yet: Fix deferred
Red Hat JBoss Enterprise Application Platform 7AffectedNo fix yet: Fix deferred
Red Hat JBoss Enterprise Application Platform 8AffectedNo 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 Single Sign-On 7AffectedNo fix yet: Fix deferred
Red Hat build of Apache Camel - HawtIO 4AffectedNo 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 3AffectedNo fix yet: Fix deferred
Red Hat build of Debezium 3AffectedNo fix yet: Fix deferred
streams for Apache Kafka 2AffectedNo fix yet: Fix deferred
streams for Apache Kafka 3AffectedNo fix yet: Fix deferred
Red Hat build of Quarkus 3.27.4.SP1Fixed RHSA-2026:26018
Red Hat build of Quarkus 3.33.2.SP1Fixed RHSA-2026:26017
Not affected: 2 products
  • Red Hat build of Quarkus 3.27.4.SP1
  • Red Hat build of Quarkus 3.33.2.SP1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45673
  2. 2026-10-03 Alias added: GHSA-xmv7-r254-6q78
  3. 2026-10-20 Affected versions changed · Red Hat

References

Advisory 2

Other 3

  • 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