Uncaught Exception in undici - CVE-2026-85014
Published: September 6, 2026
Vulnerability identifier: #VU147173
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-85014
CWE-ID: CWE-248
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an uncaught exception in the WebSocketStream socket-close handler when handling an abrupt WebSocket connection closure while a writer lock is held. A remote attacker can abruptly close a WebSocket connection to cause a denial of service.
Exploitation requires an application to use the WebSocketStream API and write through a writer.
Affected software
undici
How to mitigate CVE-2026-85014
Install security update from vendor's website.
undici - addressed in versions 7.29.1, 8.10.2