CVE-2026-17545
7.5, highOn 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,…
- CVSS
- 7.5, high high CVSS v3.1
- EPSS, next 30 days
- 0.3% higher than 24% of scored CVEs
- Exploitation
- Exploit code published
- Published
- 25 Sept 202629 days ago
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.
Details
- Vendor
- PHP Group
- Product
- PHP
- Weakness
- CWE-67 (opens in a new tab)
- Status
- Analyzed
- Updated
- 23 Oct 2026
- Assigner
- security@php.net
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References 1
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other PHP Group CVEs
Every PHP Group CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2024-4577 PHP-CGI OS Command Injection Vulnerability KEV EPSS 100% 9.8, critical
- CVE-2026-109618 PHP Group PHP Use-After-Free Vulnerability EPSS 12% 9.8, critical
- CVE-2026-109619 PHP Group PHP Use-After-Free Vulnerability EPSS 6% 8.1, high
Beyond this page
Is CVE-2026-17545 in your network?
This page tells you how dangerous CVE-2026-17545 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
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EXYS7600 OCELOT
Find it before attackers do
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EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
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Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 24 Oct 2026, not the live upstream state.