{"id":"CVE-2026-102598","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-102598","generatedAt":"2026-10-28T02:24:01.130Z","title":"Prior to 3.1.9, the safe_join function used by send_from_directory can allow a NUL: special-device path because safe_join checks the Windows device name without first removing an empty NTFS ADS marker.","description":"Werkzeug is a comprehensive WSGI web application library. Prior to 3.1.9, the safe_join function used by send_from_directory can allow a NUL: special-device path because safe_join checks the Windows device name without first removing an empty NTFS ADS marker. The trigger is that an application runs on Windows with NTFS and serves a user-specified path ending in a special device name such as NUL:. The attack mechanism is that a requested path ends in a Windows special device name with an empty ADS marker. The impact is that the special device opens successfully and the file read hangs indefinitely. This issue is fixed in version 3.1.9.","published":"2026-09-29T16:17:06.000Z","lastModified":"2026-09-30T19:38:27.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":6.3,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/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":[],"epss":{"score":0.0037,"percentile":0.30654,"date":"2026-10-26","history":[{"date":"2026-09-30","score":0.00368,"percentile":0.28277}]},"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":"2026-09-29T16:17:06.000Z","detail":{"score":"6.3","severity":"MEDIUM","publishedAt":"2026-09-29T16:17:06.010Z"},"summary":"New CVE, medium severity (CVSS 6.3)."}],"references":[{"url":"https://github.com/pallets/werkzeug/commit/8d77320bcdf3a34941ec06dcf16b03c065cd21b6","source":"security-advisories@github.com"},{"url":"https://github.com/pallets/werkzeug/pull/3309","source":"security-advisories@github.com"},{"url":"https://github.com/pallets/werkzeug/releases/tag/3.1.9","source":"security-advisories@github.com"},{"url":"https://github.com/pallets/werkzeug/security/advisories/GHSA-g6x2-hccm-hh4m","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102598","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."}