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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2026-17545

PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can cause DoS

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Status
Published
Published
Updated
Assigning organization
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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

PHP Group PHP

Default version status: unaffected

  • 8.2.* to < 8.2.34affected
  • 8.3.* to < 8.3.35affected
  • 8.4.* to < 8.4.26affected
  • 8.5.* to < 8.5.11affected

References