CVE-2026-17545
PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can cause DoS
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.
No summary for this CVE yet.
Weaknesses
Affected Products
PHP Group
oss-projectaka pear, php
Exploitability
No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
References
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