Medium

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

Type: advisorySource: Official CVE List1 source record

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.

Announced 25 Sept 2026Group revision 1

Original source ↗

CVE-2026-17545

Primary source · Revision 4

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-17545

PHP

Source reference: /containers/cna/affected/0/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "PHP Group",
    "product": "PHP",
    "versions": [
      {
        "status": "affected",
        "version": "8.2.*",
        "lessThan": "8.2.34",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "8.3.*",
        "lessThan": "8.3.35",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "8.4.*",
        "lessThan": "8.4.26",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "8.5.*",
        "lessThan": "8.5.11",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected"
  }
]