Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)
Summary
| CVE | CVE-2026-42579 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-13 19:17:23 UTC |
| Updated | 2026-07-15 02:21:35 UTC |
| Description | Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC 1035 domain name constraints during either encoding or decoding. This creates a bidirectional attack surface: malicious DNS responses can exploit the decoder, and user-influenced hostnames can exploit the encoder. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final. |
Risk And Classification
Primary CVSS: v3.1 9.1 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS: 0.000320000 probability, percentile 0.095640000 (date 2026-05-25)
Problem Types: CWE-20 | CWE-400 | CWE-626 | CWE-1286 | CWE-20 CWE-20: Improper Input Validation | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-626 CWE-626: Null Byte Interaction Error (Poison Null Byte) | CWE-1286 Improper Validation of Syntactic Correctness of Input
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.1 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 3.1 | CNA | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Netty | Netty | affected >= 4.2.0.Alpha1, < 4.2.13.Final | Not specified |
| CNA | Netty | Netty | affected < 4.1.133.Final | Not specified |
| ADP | Red Hat | Cryostat 4 On RHEL 9 | unaffected 4.2.0-10 * rpm | Not specified |
| ADP | Red Hat | Cryostat 4 On RHEL 9 | unaffected 4.2.0-10 * rpm | Not specified |
| ADP | Red Hat | Cryostat 4 On RHEL 9 | unaffected 4.2.0-10 * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel 4.18.1.P1 For Spring Boot 3.5.16 | unaffected codec-dns * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Quarkus 3.27.4 | unaffected codec-dns * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Quarkus 3.33.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift Dev Spaces 3.28 | unaffected 1780948325 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Dev Spaces 3.28 | unaffected 1780696380 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Dev Spaces 3.28 | unaffected 1780694994 * rpm | Not specified |
| ADP | Red Hat | Red Hat OpenShift Dev Spaces 3.29 | unaffected 1782989027 * rpm | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | OpenShift Serverless | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apache Camel 4 For Quarkus 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apicurio Registry 2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Apicurio Registry 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Debezium 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of Keycloak | Not specified | Not specified |
| ADP | Red Hat | Red Hat Build Of OptaPlanner 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Data Grid 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AI RHEL AI 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux AI RHEL AI 3 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Fuse 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform 8 | Not specified | Not specified |
| ADP | Red Hat | Red Hat JBoss Enterprise Application Platform Expansion Pack | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat Process Automation 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Single Sign-On 7 | Not specified | Not specified |
| ADP | Red Hat | Streams For Apache Kafka 2 | Not specified | Not specified |
| ADP | Red Hat | Streams For Apache Kafka 3 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:23808 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | github.com | Exploit, Mitigation, Vendor Advisory |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:37390 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:25123 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-42579 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:36820 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:28010 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:24502 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42579.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-05-13T19:01:25.062Z | Reported to Red Hat. |
| ADP | 2026-05-13T18:01:52.500Z | Made public. |
Solutions
ADP: RHSA-2026:28010: Cryostat 4 on RHEL 9
ADP: RHSA-2026:25123: Red Hat OpenShift Dev Spaces 3.28
ADP: RHSA-2026:36820: Red Hat OpenShift Dev Spaces 3.29
ADP: RHSA-2026:37390: Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
ADP: RHSA-2026:23808: Red Hat build of Quarkus 3.27.4
ADP: RHSA-2026:24502: Red Hat build of Quarkus 3.33.2
Workarounds
ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
There are currently no legacy QID mappings associated with this CVE.