CVE-2026-20934

High · 7.5

CVSS

7.5

EPSS

0.7%

Published

Jan 13, 2026

CISA due date

—

The record

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

Affected packages

Ecosystem	Package	Introduced	Fixed