CVE-2026-45736

highpriority · track · 30EPSS 0.007 · 52 %ileDEEURUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.68% (52nd) EPSS
CVSS 7.5 · high
Is it mine?
50 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-21

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.4–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6
v3.14.4mediumAV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU
v3.14.4mediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU
v3.14.4mediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:Nsecondary · security-advisories@github.comexploitability 0.7 · impact 3.6
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondaryexploitability 3.9 · impact 3.6
v3.14.4mediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-824USCWE-908USCWE-908USCWE-908US
04

affected products (50)

Products and version ranges known to be affected.

showing 20 of 50
05

advisories (5)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-1955Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere SchwachstellenDeutsch2026-06-16csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

  • WID-SEC-W-2026-2118IBM App Connect Enterprise: Mehrere SchwachstellenDeutsch2026-06-28csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um einen Denial of Service Angriff durchzuführen, und um Informationen offenzulegen.

  • WID-SEC-W-2026-2460Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere SchwachstellenDeutsch2026-07-21csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management ausnutzen, um beliebigen Code auszuführen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

  • WID-SEC-W-2026-3046IBM Concert: Mehrere SchwachstellenDeutsch2026-08-26csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in IBM Concert ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, um einen SQL-Injection Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.

  • GHSA-58qx-3vcg-4xpxws: Uninitialized memory disclosure2026-05-18ghsa · osvUS

    ### Impact The `websocket.close()` implementation is vulnerable to uninitialized memory disclosure when a `TypedArray` is passed as the reason argument. ### Proof of concept ```js import { deepStrictEqual } from 'node:assert'; import { WebSocket, WebSocketServer } from 'ws'; const wss = new WebSocketServer( { port: 0, skipUTF8Validation: true }, function () { const { port } = wss.address(); const ws = new WebSocket(`ws://localhost:${port}`, { skipUTF8Validation: true }); ws.on('close', function (code, reason) { deepStrictEqual(reason, Buffer.alloc(80)); }); } ); wss.on('connection', function (ws) { ws.close(1000, new Float32Array(20)); }); ``` ### Patches The vulnerability was fixed in ws@8.20.1 (https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086). ### Credits Credit for the private and responsible disclosure of this issue goes to [Nikita Skovoroda](https://github.com/ChALkeR). ### Remarks Although the calculated CVSS severity is medium, the actual severity is believed to be low, as the flaw is only exploitable through misuse that is unlikely in practice. ### Resources - https://github.com/advisories/GHSA-58qx-3vcg-4xpx - https://www.cve.org/CVERecord?id=CVE-2026-45736

06

also known as (4)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundosvNVDCVE.orgMITRE
published 2026-05-15modified 2026-09-11
08

references (36)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan