CVE-2026-17545

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp	Vendor Advisory Exploit
https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp	Vendor Advisory Exploit

Configurations

Configuration 1 (hide)

AND

OR	cpe:2.3:a:php:php::::::::
	cpe:2.3:a:php:php::::::::
	cpe:2.3:a:php:php::::::::
	cpe:2.3:a:php:php::::::::

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

History

23 Oct 2026, 14:43

Type	Values Removed	Values Added
CPE		cpe:2.3:a:php:php:::::::: cpe:2.3:o:microsoft:windows:-:::::::*
References	~~() https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp -~~	() https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp - Vendor Advisory, Exploit
First Time		Microsoft windows Microsoft Php php Php
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

25 Sep 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-25 21:17

Updated : 2026-10-23 14:43

NVD link : CVE-2026-17545

Mitre link : CVE-2026-17545

CVE.ORG link : CVE-2026-17545

JSON object : View

Products Affected

php

php

microsoft

windows

CWE

CWE-67

Improper Handling of Windows Device Names

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