What is CVE-2026-45736?

CVE-2026-45736 is a medium-severity vulnerability in Websockets Ws, classified under Use of Uninitialized Resource. CVSS score: 4.4/10. Published 2026-05-15.

How severe is CVE-2026-45736?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Websockets Ws

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…

EPSS: 0.000 (1.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N.

Affected products

Websockets Ws — versions >= 8.0.0, < 8.20.1
Ws_project Ws

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45736?: CVE-2026-45736 is a medium-severity vulnerability in Websockets Ws, classified under Use of Uninitialized Resource. CVSS score: 4.4/10. Published 2026-05-15.
How severe is CVE-2026-45736?: Medium severity. CVSS v3 base score is 4.4 out of 10.