PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can cause DoS
At a glance
Severity
MEDIUM 6.9
EPSS
EPSS 0.37 % · percentile 30 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
php
NVD status
Analyzed
Description
On Windows, PHP's filesystem and stream APIs do not reject reserved device names such as CON, PRN, AUX, NUL, COM1 to COM9, LPT1 to LPT9, CONIN$ and CONOUT$ when they appear as a component of a path. An attacker-controlled filename therefore reaches CreateFileW() and opens a device instead of the regular file the application expected, which can block or hang the request and exhaust worker processes.
