high7.5
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$ whe…
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Php | Php | from 8.2.0 before 8.2.34 from 8.3.0 before 8.3.35 from 8.4.0 before 8.4.26 from 8.5.0 before 8.5.11 |