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Public proof of conceptFix available

CVE-2026-45736

A public proof of concept exists; no exploitation attested.

  • Published2026-05-15
  • Fixed in8.20.1
  • WeaknessCWE-824 · CWE-908

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-05-1515:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-45736?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-45736?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Ws project ws
BranchAffectedFixed in
8.x≥ 8.0.0, < 8.20.18.20.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • websockets ws
    Affected
    • = >= 8.0.0, < 8.20.1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-05-15

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/wsRoot:npmall versions · fixed in 8.18.0-root.io.1
  • @rootio/wsRoot:npmall versions · fixed in 8.13.0-root.io.1
  • @rootio/wsRoot:npmall versions · fixed in 8.13.0-root.io.2
  • @rootio/wsRoot:npmall versions · fixed in 8.17.1-root.io.1
  • @rootio/wsRoot:npmall versions · fixed in 8.17.1-root.io.2
  • @rootio/wsRoot:npmall versions · fixed in 8.17.1-root.io.3
  • @rootio/wsRoot:npmall versions · fixed in 8.18.0-root.io.2
  • @rootio/wsRoot:npmall versions · fixed in 8.18.1-root.io.1

128 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-45736 Red Hat Product Security463 products fixed · 40 known affected

    ws: ws: Uninitialized memory disclosure via `websocket.close()` with `TypedArray`

    workload-availability/node-healthcheck-must-gather-rhel9 as a component of Node HealthCheck Operator · workload-availability/node-healthcheck-operator-bundle as a component of Node HealthCheck Operator · workload-availability/node-healthcheck-rhel9-operator as a component of Node HealthCheck Operator · +37 more

  • RHSA-2026:84734 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

  • RHSA-2026:73987 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.3.7 - Red Hat OpenShift AI

  • RHSA-2026:70829 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: RHTAS 1.3.8 - Red Hat Trusted Artifact Signer Release

  • RHSA-2026:66545 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AMQ Broker 7.13.6 release and security update

  • RHSA-2026:66488 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AMQ Broker 7.14.1 release and security update

25 more advisories

Full record on NVD

Fix

  1. Update Ws project ws to 8.20.1
  2. Vendor fix Red Hat Product Security RHSA-2026:84734 · 4 productsFor Red Hat OpenShift AI 3.4.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  3. Vendor fix Red Hat Product Security RHSA-2026:73987 · 4 productsFor Red Hat OpenShift AI 3.3.7 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  4. Vendor fix Red Hat Product Security RHSA-2026:70829 · 1 productRed Hat Trusted Artifact Signer simplifies cryptographic signing and verifying of software artifacts such as container images, binaries and source code changes. It is a self-managed on-premise deployment of the Sigstore project available at https://sigstore.dev Platform Engineers, Software Develop…
  5. Vendor fix Red Hat Product Security RHSA-2026:66545 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings. The References section of this erratum contains a download link (you must log in to download the update).
  6. Vendor fix Red Hat Product Security RHSA-2026:65126 · 4 productsFor Red Hat OpenShift AI 2.25.11 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  7. Vendor fix Red Hat Product Security RHSA-2026:60520 · 28 productsFor Red Hat OpenShift AI 3.4.4 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2026-05-15
Last Modified
2026-10-26
NVD status
Modified
MSRC Title
ws: Uninitialized memory disclosure
GitHub Advisory
GHSA-58qx-3vcg-4xpx

Frequently asked questions

What is CVE-2026-45736?

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.

Is CVE-2026-45736 actively exploited?

A proof-of-concept exploit exists for CVE-2026-45736, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-45736?

CVE-2026-45736 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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