Use of uninitialized resource in ws - CVE-2026-45736
Published: May 12, 2026 / Updated: June 18, 2026
Vulnerability identifier: #VU131249
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45736
CWE-ID: CWE-908
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: WebSockets
Affected software:
ws
ws
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to use of uninitialized resource in websocket.close() when processing a TypedArray passed as the reason argument. A remote privileged user can pass a crafted TypedArray as the close reason to disclose sensitive information.
The issue is only exploitable through misuse that is unlikely in practice.
How to mitigate CVE-2026-45736
Install security update from vendor's website.