Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp
- https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp
FAQ
What is CVE-2026-17545?
CVE-2026-17545 is a documented vulnerability. 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. A...
How severe is CVE-2026-17545?
CVSS scoring is not yet available for CVE-2026-17545. Check NVD for updates.
Is there a patch for CVE-2026-17545?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.