{"id":"CVE-2026-17545","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-17545","generatedAt":"2026-10-28T04:14:40.527Z","title":"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.","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.","published":"2026-09-25T21:17:23.000Z","lastModified":"2026-10-23T14:43:16.000Z","status":"Analyzed","sourceIdentifier":"security@php.net","cvss":{"version":"4.0","score":6.9,"severity":"MEDIUM","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-67"],"affected":["php/php"],"epss":{"score":0.00368,"percentile":0.30466,"date":"2026-10-27","history":[{"date":"2026-09-26","score":0.00322,"percentile":0.22723}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.37%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-25T21:17:23.000Z","detail":{"score":"6.9","severity":"MEDIUM","publishedAt":"2026-09-25T21:17:23.253Z"},"summary":"New CVE, medium severity (CVSS 6.9)."}],"references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp","tags":["Vendor Advisory","Exploit"],"source":"security@php.net"},{"url":"https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp","tags":["Vendor Advisory","Exploit"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-17545","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}