CVE-2026-17545: CWE-67 Improper handling of windows device names in PHP Group PHP
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.
CVE-2026-17545: CWE-67 Improper handling of windows device names in PHP Group PHP
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.
CVSS v4.0
Score 6.9medium
Affected software
PHP Group
PHP
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- php
- Date Reserved
- 2026-07-27T10:15:15.310Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab6da8af7a7c5410640caa6
Added to database: 09/25/2026, 20:33:14 UTC
Last updated: 09/25/2026, 20:33:14 UTC
Views: 1
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