Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation
Summary
| CVE | CVE-2026-42578 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-13 19:17:23 UTC |
| Updated | 2026-07-21 12:18:38 UTC |
| Description | Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final. |
Risk And Classification
Primary CVSS: v4.0 2.9 LOW from [email protected]
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.000100000 probability, percentile 0.012420000 (date 2026-05-25)
Problem Types: CWE-113 | CWE-93 | CWE-113 CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') | CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 2.9 | LOW | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/C... |
| 4.0 | CNA | DECLARED | 2.9 | LOW | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P |
| 3.1 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| 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 | 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 |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
PresentPrivileges Required
NoneUser Interaction
NoneConfidentiality
NoneIntegrity
LowAvailability
NoneSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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 handler-proxy * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Quarkus 3.27.4 | unaffected handler-proxy * rpm | Not specified |
| ADP | Red Hat | Red Hat Build Of Quarkus 3.33.2 | Not specified | Not specified |
| ADP | Red Hat | Red Hat OpenShift AI 2.25 | unaffected 1783443816 * rpm | 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 AMQ Broker 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat AMQ Clients | 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 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 OpenShift AI RHOAI | Not specified | Not specified |
| ADP | Red Hat | Red Hat Process Automation 7 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Satellite 6 | Not specified | Not specified |
| ADP | Red Hat | Red Hat Satellite 6 | 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 | |
| access.redhat.com/errata/RHSA-2026:42644 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| 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 | |
| github.com/netty/netty/security/advisories/GHSA-45q3-82m4-75jr | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | github.com | Exploit, Mitigation, Vendor Advisory |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42578.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-42578 | 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 | |
| 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 | 2026-05-13T19:02:00.826Z | Reported to Red Hat. |
| ADP | 2026-05-13T17:57:43.538Z | Made public. |
Solutions
ADP: RHSA-2026:28010: Cryostat 4 on RHEL 9
ADP: RHSA-2026:42644: Red Hat OpenShift AI 2.25
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
There are currently no legacy QID mappings associated with this CVE.