Vulnerability Details 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$ 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 29.5%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-17545
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cpe:2.3:a:php:php:*
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cpe:2.3:a:php:php:8.3.34
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cpe:2.3:a:php:php:8.4.25
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cpe:2.3:a:php:php:8.5.10
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cpe:2.3:o:microsoft:windows:-