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CVE-2026-17545

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

Description (CNA)

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 (CNA)

Vendor / productVersions
PHP Group / PHPaffected 8.2.* before 8.2.34; affected 8.3.* before 8.3.35; affected 8.4.* before 8.4.26; affected 8.5.* before 8.5.11

CWE

CWE-67

References

ADP enrichment

CISA-ADP

No English description supplied.