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Full vulnerability report · 2026
CVE-2026-62380High confidence

Netty before 4.2.16.Final SOCKS Proxy Null Byte Injection

netty · netty

6.3MediumCVSS 4.0
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · esm-appsnettyUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical record ↗Source updated 8 Sept 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-62380 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityio.netty/netty-codec-socks: Netty: Null byte and CRLF injection in SOCKS client encoders can lead to domain spoofing
49 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • exploit-intelligence/agent-client-rhel9 as a component of Exploit Intelligence
  • openshift-serverless-1/kn-ekb-dispatcher-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-ekb-receiver-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-aws-sqs-source-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9 as a component of OpenShift Serverless
  • openshift-serverless-1/kn-eventing-integrations-timer-source-rhel9 as a component of OpenShift Serverless
  • netty-codec-socks as a component of Red Hat AMQ Broker 7
Summary
A flaw was found in the Netty SOCKS client encoders. This vulnerability allows a remote attacker to inject null bytes or Carriage Return Line Feed (CRLF) characters into domain address and authentication fields due to insufficient validation. By manipulating these fields, an attacker can truncate or alter values, potentially leading to domain spoofing, SOCKS4 user ID truncation, authentication data injection, and protocol confusion.
Remediation
Applications utilizing Netty's SOCKS client encoders should implement robust input validation and sanitization for all domain address and authentication credential fields. If SOCKS proxy client functionality is not required by the application, it should be disabled to remove the attack surface.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-64272

No EUVD known-exploited evidence

Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEncoder) client encoders, which fail to validate domain address and authentication (username/password) fields. An attacker able to control these fields can inject null bytes or CRLF characters to truncate or alter values, potentially enabling domain spoofing, SOCKS4 userid truncation, authentication data injection, and protocol confusion. Fixed in 4.2.17.Final and 4.1.137.Final.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
6.3 · CVSS 4.0
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEncoder) client encoders, which fail to validate domain address and authentication (username/password) fields. An attacker able to control these fields can inject null bytes or CRLF characters to truncate or alter values, potentially enabling domain spoofing, SOCKS4 userid truncation, authentication data injection, and protocol confusion. Fixed in 4.2.17.Final and 4.1.137.Final.

What

Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEncoder) client encoders, which fail to validate domain address and authentication (username/password) fields. An attacker able to control these fields can inject null bytes or CRLF characters to truncate or alter values, potentially enabling domain spoofing, SOCKS4 userid truncation, authentication data injection, and protocol confusion. Fixed in 4.2.17.Final and 4.1.137.Final.

Why

The product does not properly handle null bytes or NUL characters when passing data between different representations or components.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEncoder) client encoders, which fail to validate domain address and authentication (username/password) fields. An attacker able to control these fields can inject null bytes or CRLF characters to truncate or alter values, potentially enabling domain spoofing, SOCKS4 userid truncation, authentication data injection, and protocol confusion. Fixed in 4.2.17.Final and 4.1.137.Final.

Why

The product does not properly handle null bytes or NUL characters when passing data between different representations or components.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Null Byte Interaction Error (Poison Null Byte) → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-626 ↗

CWE-626: Null Byte Interaction Error (Poison Null Byte). The product does not properly handle null bytes or NUL characters when passing data between different representations or components.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATPresentAttack requirements: A particular deployment or execution condition must be present.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SILowSubsequent-system integrity: A successful attack can cause a limited loss.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
Stolen credentials, tokens and legitimate administration functions may provide continued access without deploying a large custom toolset.
NetworkUnauthenticatedCWE-626
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-64272Official EUVD mapping

Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final contain null byte, CRLF, and credential injection vulnerabilities in the SOCKS4 (Socks4ClientEncoder) and SOCKS5 (Socks5ClientEncoder) client encoders, which fail to validate domain address and authentication (username/password) fields. An attacker able to control these fields can inject null bytes or CRLF characters to truncate or alter values, potentially enabling domain spoofing, SOCKS4 userid truncation, authentication data injection, and protocol confusion. Fixed in 4.2.17.Final and 4.1.137.Final.

Official EUVD record
BSI · German · WID-SEC-W-2026-2712Netty: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Netty ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen, und um Informationen offenzulegen.

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
exploit-intelligence/agent-client-rhel9 as a component of Exploit Intelligence; openshift-serverless-1/kn-ekb-dispatcher-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-ekb-receiver-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-ddb-streams-source-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-s3-sink-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-s3-source-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-sns-sink-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-sqs-sink-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-aws-sqs-source-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-log-sink-rhel9 as a component of OpenShift Serverless; openshift-serverless-1/kn-eventing-integrations-timer-source-rhel9 as a component of OpenShift Serverless; netty-codec-socks as a component of Red Hat AMQ Broker 7; netty-codec-socks as a component of Red Hat build of Apache Camel 4 for Quarkus 3; netty-codec-socks as a component of Red Hat build of Apache Camel for Spring Boot 4; netty-codec-socks as a component of Red Hat build of Apicurio Registry 3; netty-codec-socks as a component of Red Hat build of Debezium 3; keycloak/rhbk-openshift-rhel9 as a component of Red Hat Build of Keycloak; keycloak/rhbk-rhel9-operator as a component of Red Hat Build of Keycloak; netty-codec-socks as a component of Red Hat Build of Keycloak; rhbk/keycloak-rhel9 as a component of Red Hat Build of Keycloak; rhbk/keycloak-rhel9-operator as a component of Red Hat Build of Keycloak; netty-codec-socks as a component of Red Hat build of Quarkus; bazel7.src as a component of Red Hat Enterprise Linux AI (RHEL AI) 3; bazel8.src as a component of Red Hat Enterprise Linux AI (RHEL AI) 3; netty-codec-socks as a component of Red Hat Fuse 7; jboss-eap-7/eap74-els-openjdk11-openshift-rhel8 as a component of Red Hat JBoss Enterprise Application Platform 7; jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 as a component of Red Hat JBoss Enterprise Application Platform 7; jboss-eap-7/eap74-els-openjdk8-openshift-rhel8 as a component of Red Hat JBoss Enterprise Application Platform 7; netty-codec-socks as a component of Red Hat JBoss Enterprise Application Platform 7; netty-codec-socks as a component of Red Hat JBoss Enterprise Application Platform 8; and 19 more
Fixed
4.2.16.Final; 4.1.137.Final
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
Applications utilizing Netty's SOCKS client encoders should implement robust input validation and sanitization for all domain address and authentication credential fields. If SOCKS proxy client functionality is not required by the application, it should be disabled to remove the attack surface.
04

Evidence and provenance

Published 22 Aug 2026 · Last source change 26 Aug 2026, 16:16 UTC · CWE-626 · Null Byte Interaction Error (Poison Null Byte)

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-23
European sourceENISA EUVD · EUVD-2026-64272
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →
  1. Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link to authoritative remediation link · vendor advisory.
    Before
    authoritative remediation link
    After
    authoritative remediation link · vendor advisory
    disclosure@vulncheck.com ↗
  2. ENISA EUVD mappingEUVD-2026-64272 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-64272"}
    ENISA EUVD ↗
  3. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-64272↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-62380 · cve.blacktree.nl