{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-17545","assignerOrgId":"dd77f84a-d19a-4638-8c3d-a322d820ed2b","state":"PUBLISHED","assignerShortName":"php","dateReserved":"2026-07-27T10:15:15.310Z","datePublished":"2026-09-25T20:18:11.288Z","dateUpdated":"2026-09-25T20:43:34.157Z"},"containers":{"cna":{"providerMetadata":{"orgId":"dd77f84a-d19a-4638-8c3d-a322d820ed2b","shortName":"php","dateUpdated":"2026-09-25T20:18:11.288Z"},"title":"PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can cause DoS","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-67","description":"CWE-67 Improper handling of windows device names","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-165","descriptions":[{"lang":"en","value":"CAPEC-165 File Manipulation"}]}],"affected":[{"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"}],"descriptions":[{"lang":"en","value":"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>On Windows, PHP's filesystem and stream APIs do not reject reserved device names such as <code>CON</code>, <code>PRN</code>, <code>AUX</code>, <code>NUL</code>, <code>COM1</code> to <code>COM9</code>, <code>LPT1</code> to <code>LPT9</code>, <code>CONIN$</code> and <code>CONOUT$</code> when they appear as a component of a path. An attacker-controlled filename therefore reaches <code>CreateFileW()</code> and opens a device instead of the regular file the application expected, which can block or hang the request and exhaust worker processes.</p>"}]}],"references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subAvailabilityImpact":"HIGH","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6.9,"vectorString":"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"}}],"credits":[{"lang":"en","value":"@Crispr (GitHub)","type":"reporter"},{"lang":"en","value":"@OSTIF-Derek","type":"reporter"},{"lang":"en","value":"Shivam Mathur","type":"remediation developer"},{"lang":"en","value":"Jakub Zelenka","type":"remediation reviewer"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"references":[{"url":"https://github.com/php/php-src/security/advisories/GHSA-9f67-6fw4-hpfp","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-25T20:43:10.043800Z","id":"CVE-2026-17545","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-25T20:43:34.157Z"}}]}}