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CVE-2026-45736— ws: Uninitialized memory disclosure

Quick assessment

Affected
websockets ws
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ws是WebSockets开源的一个 Node.js WebSocket 库。 ws 8.20.1之前版本存在安全漏洞，该漏洞源于websocket.close实现中TypedArray作为reason参数时存在未初始化内存泄露。

CVSS 4.4 · Medium EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1560.002 · Archive via Library

Affected Version Matrix 1

VendorProduct Version RangeStatus
websockets ws >= 8.0.0, < 8.20.1 affected
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I. Basic Information for CVE-2026-45736

Vulnerability Information
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Vulnerability Title
ws: Uninitialized memory disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Vulnerability Title
ws 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ws是WebSockets开源的一个 Node.js WebSocket 库。 ws 8.20.1之前版本存在安全漏洞，该漏洞源于websocket.close实现中TypedArray作为reason参数时存在未初始化内存泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
websockets ws >= 8.0.0, < 8.20.1 -

II. Public POCs for CVE-2026-45736

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III. Intelligence Information for CVE-2026-45736

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Patches & Fixes for CVE-2026-45736 (1)

Vendor Advisories for CVE-2026-45736 (1)

IV. Related Vulnerabilities

Same product: ws
Same vendor: websockets
Same weakness: CWE-908

V. Comments for CVE-2026-45736

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