CVE-2026-17545
MEDIUM
MEDIUM
Priority: 0.03
BB Relevance:
64/100
Published: 2026-09-25
Modified: 2026-10-23
First seen: 2026-10-29
Status: active
Attack Surface
Network
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
None
S:
X
AT:
Present
VC:
None
VI:
None
VA:
Low
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.
Weakness Classification (1)
References & Advisories (1)
Vendor Advisory
Exploit