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 fixed in 8.20.1.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (50.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.001
Affected products
- Websockets Ws — versions >= 8.0.0, < 8.20.1
- Ws Project
Weakness classification (CWE)
References
- github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086 (Patch)
- github.com/websockets/ws/security/advisories/GHSA-58qx-3vcg-4xpx (Exploit, Patch, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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.