High severity · published May 15, 2026
CVE-2026-45736
ws: Uninitialized memory disclosure
7.5
CVSS
0.7%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WS
ws · websockets
>= 8.0.0, < 8.20.1 · source: vendor, NVD
C4
Cryostat 4 on RHEL 9 · Red Hat
All versions, or not specified · source: CISA
NH
Node HealthCheck Operator · Red Hat
All versions, or not specified · source: CISA
OL
OpenShift Lightspeed · Red Hat
All versions, or not specified · source: CISA
OP
OpenShift Pipelines · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Ansible Automation Platform 2 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Ansible Automation Platform 2.6 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Build of Podman Desktop · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Build of Podman Desktop - Tech Preview · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Connectivity Link 1 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Data Grid 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Developer Hub 1.10 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45736
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45736
Patch
https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086
Exploit
https://github.com/websockets/ws/security/advisories/GHSA-58qx-3vcg-4xpx
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:26638
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:26994
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:27171
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:29197
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