CVE-2026-17545
Published:September 25, 2026
Updated:October 09, 2026
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.
Affected Packages
https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.5.0alpha1 <php-8.5.11Fix Suggestion:
Update to version php-8.5.11https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.4.0alpha1 <php-8.4.26Fix Suggestion:
Update to version php-8.4.26https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.3.0alpha1 <php-8.3.35Fix Suggestion:
Update to version php-8.3.35https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.2.0alpha1 <php-8.2.34Fix Suggestion:
Update to version php-8.2.34Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
HIGH
CVSS v3
Base Score:
4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Improper Handling of Windows Device Names
EPSS
Base Score:
0.32