Uninitialized Mem Disclosure via ws.websocket.close() in ws <8.20.1
CVE-2026-45736 Published on May 15, 2026

ws: Uninitialized memory disclosure
ws is an open source WebSocket client and server for Node.js. Prior to 8.20.1, the websocket.close() implementation is vulnerable to uninitialized memory disclosure when a TypedArray is passed as the reason argument. This vulnerability is fixed in 8.20.1.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-45736 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-45736. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
NONE

Weakness Types

Use of Uninitialized Resource

The software uses or accesses a resource that has not been initialized. When a resource has not been properly initialized, the software may behave unexpectedly. This may lead to a crash or invalid memory access, but the consequences vary depending on the type of resource and how it is used within the software.

Access of Uninitialized Pointer

The program accesses or uses a pointer that has not been initialized.


Products Associated with CVE-2026-45736

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Red Hat Discovery
 
Red Hat Hummingbird
 
Red Hat Cryostat
 
Red Hat Gatekeeper
 
Red Hat Rhmt
 
Red Hat Workload Availability Nhc
 
Red Hat Openshift Lightspeed
 
Red Hat Openshift Pipelines
 
Red Hat Amq Broker
 
Red Hat Ansible Automation Platform
 
Red Hat Apache Camel Hawtio
 
Red Hat Build Keycloak
 
Red Hat Podman Desktop
 
Red Hat Connectivity Link
 
Red Hat Jboss Data Grid
 
Red Hat Rhdh
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Enterprise Linux Ai
 
Red Hat Openshift Ai
 
Red Hat Openshift
 
Red Hat Openshift Data Foundation
 
Red Hat Openshift Devspaces
 
Red Hat Container Native Virtualization
 
Red Hat Quay
 
Red Hat Satellite
 
Red Hat Trusted Artifact Signer
 
Red Hat Ansible Portal
 
Red Hat Service Mesh
 
Red Hat Camel Spring Boot
 
Red Hat Jboss Fuse
 
Red Hat Jboss Enterprise Application Platform
 
Red Hat Jbosseapxp
 

Affected Versions

websockets ws: Red Hat Cryostat 4 on RHEL 9: Red Hat Ansible Automation Platform 2.6: Red Hat Developer Hub 1.10: Red Hat Developer Hub 1.9: Red Hat Discovery 2: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat Migration Toolkit 1.8: Red Hat OpenShift Container Platform 4.19: Red Hat OpenShift Container Platform 4.2: Red Hat OpenShift Container Platform 4.2: Red Hat OpenShift Container Platform 4.21: Red Hat OpenShift Container Platform 4.21: Red Hat OpenShift Container Platform 4.22: Red Hat OpenShift Dev Spaces 3.29: Red Hat OpenShift Dev Spaces 3.29: Red Hat Trusted Artifact Signer 1.4: Red Hat Cryostat 4: Red Hat Cryostat 4: Red Hat Cryostat 4: Red Hat Gatekeeper 3: Red Hat Node HealthCheck Operator: Red Hat Node HealthCheck Operator: Red Hat Node HealthCheck Operator: Red Hat OpenShift Lightspeed: Red Hat OpenShift Lightspeed: Red Hat OpenShift Lightspeed: Red Hat OpenShift Pipelines: Red Hat OpenShift Pipelines: Red Hat OpenShift Pipelines: Red Hat OpenShift Pipelines: Red Hat OpenShift Pipelines: Red Hat OpenShift Service Mesh 2: Red Hat OpenShift Service Mesh 2: Red Hat OpenShift Service Mesh 3: Red Hat OpenShift Service Mesh 3: Red Hat OpenShift Service Mesh 3: Red Hat OpenShift Service Mesh 3: Red Hat AMQ Broker 7: Red Hat Ansible Automation Platform 2: Red Hat Ansible Automation Platform 2: Red Hat Ansible Automation Platform 2: Red Hat Ansible Automation Platform 2: Red Hat Ansible Automation Platform 2: Red Hat Ansible Automation Platform 2: Red Hat build of Apache Camel for Spring Boot 4: Red Hat build of Apache Camel - HawtIO 4: Red Hat Build of Keycloak: Red Hat Build of Podman Desktop: Red Hat Build of Podman Desktop - Tech Preview: Red Hat Build of Podman Desktop - Tech Preview: Red Hat Build of Podman Desktop - Tech Preview: Red Hat Connectivity Link 1: Red Hat Data Grid 8: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux AI (RHEL AI) 3: Red Hat Enterprise Linux AI (RHEL AI) 3: Red Hat Enterprise Linux AI (RHEL AI) 3: Red Hat Enterprise Linux AI (RHEL AI) 3: Red Hat Enterprise Linux AI (RHEL AI) 3: Red Hat Enterprise Linux AI (RHEL AI) 3: Red Hat Fuse 7: Red Hat Hardened Images: Red Hat Hardened Images: Red Hat JBoss Enterprise Application Platform 8: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift AI (RHOAI): Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4: Red Hat Openshift Data Foundation 4: Red Hat Openshift Data Foundation 4: Red Hat Openshift Data Foundation 4: Red Hat Openshift Data Foundation 4: Red Hat OpenShift Virtualization 4: Red Hat OpenShift Virtualization 4: Red Hat Quay 3: Red Hat Satellite 6: Red Hat Self-service automation portal 2: Red Hat Self-service automation portal 2:

Exploit Probability

EPSS
0.75%
Percentile
51.00%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.