CVE-2026-17545 (GCVE-0-2026-17545)

Vulnerability from cvelistv5 – Published: 2026-09-25 20:18 – Updated: 2026-09-25 20:43
VLAI
Title
PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can cause DoS
Summary
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.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 20:43 UTC
CWE
  • CWE-67 - Improper handling of windows device names
Assigner
References
Impacted products
Vendor Product Version CPE status
PHP Group PHP Affected: 8.2.* , < 8.2.34 (semver)
Affected: 8.3.* , < 8.3.35 (semver)
Affected: 8.4.* , < 8.4.26 (semver)
Affected: 8.5.* , < 8.5.11 (semver)
guessed Create a notification for this product.
Credits
@Crispr (GitHub) @OSTIF-Derek Shivam Mathur Jakub Zelenka
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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