{"id":"CVE-2026-17545","title":"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","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 theref…","severity":"medium","cvss":6.9,"cvssVector":"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","cwe":["CWE-67","CWE-66"],"vendor":"PHP Group","product":"PHP","affected":["PHP >= 8.2.* < 8.2.34","PHP >= 8.3.* < 8.3.35","PHP >= 8.4.* < 8.4.26","PHP >= 8.5.* < 8.5.11"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T21:17:23.253","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-17545","references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp","label":"security@php.net"},{"url":"https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-17545.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-17545"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541645"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-17545"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-17545"},{"url":"https://access.redhat.com/errata/RHSA-2026:70720"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-25T20:43:10.043800Z"},"cvssSource":"cna","ingestedAt":"2026-09-25T21:19:40.144Z","patched":["hardened_images"],"scores":{"cna":6.9,"vendor":5.9},"slug":"CVE-2026-17545","body":"## Overview\n\nOn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:70720** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70720)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-17545.json)","depth":"twilight","depthScore":50,"depthScoreParts":{"impact":38,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}