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6.9 Medium

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…

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 and versions

Product Affected versions Fixed in
PHP 8.5 earliest → < 8.5.11 8.5.11
PHP 8.4 earliest → < 8.4.26 8.4.26
PHP 8.3 earliest → < 8.3.35 8.3.35
PHP 8.2 earliest → < 8.2.34 8.2.34

References

Timeline

  1. Published
  2. Last modified

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