{"affected":[{"defaultStatus":"unaffected","ecosystem":"pypi","packageName":"tornado","product":"tornado","source":"CNA: VulnCheck","vendor":"tornadoweb","versions":[{"lessThan":"6.6","status":"affected","version":"0","versionType":"custom"},{"status":"unaffected","version":"6.6","versionType":"custom"}]}],"cveId":"CVE-2026-123534","cwes":["CWE-22"],"description":"Tornado before 6.6 contains a path traversal vulnerability in RequestHandler.static_url() and get_version() that allows attackers to hash files outside static_path using ../ sequences. Attackers controlling input passed to static_url() can obtain SHA-512 hashes of readable files to confirm their existence, or reference /dev/zero to block the event loop indefinitely.","epss":{"date":"2026-11-09","percentile":0.27369,"score":0.00338},"exploits":[],"kev":null,"metrics":[{"score":8.3,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":6.5,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H","version":"3.1"},{"score":8.3,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":6.5,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H","version":"3.1"}],"modifiedAt":1794233140281,"publishedAt":1794101862381,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-v8g8-cp5j-42fg"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/tornado-before-6.6-path-traversal-via-static-url-version-hashing"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-v8g8-cp5j-42fg"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/tornado-before-6.6-path-traversal-via-static-url-version-hashing"}],"remediation":[],"revision":"a9b0d73a3a4cf63196e692ad5aa37f1fe7f724f3edb22f2075f35276be483c27","sources":[{"modifiedAt":1794233140281,"name":"CNA: VulnCheck","retrievedAt":1794233346957,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123534"},{"modifiedAt":1794104203863,"name":"NVD","retrievedAt":1794118570352,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123534"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794237015056,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123534"}],"ssvc":{"assessedAt":1794233131090,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Tornado before 6.6 Path Traversal via static_url() Version Hashing","updatedAt":1794237015056}