{"id":"CVE-2026-103263","aliases":["AZL-105375","BELL-CVE-2026-103263","DEBIAN-CVE-2026-103263","EUVD-2026-90657","GHSA-4cjq-6jh9-w2f5","UBUNTU-CVE-2026-103263","USN-8952-1","USN-8952-2"],"status":"published","title":"Tornado before 6.5.9 StaticFileHandler Path Traversal via Symlink","description":"Tornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links inside the static root without confirming the resolved target stays within it. When a symlink pointing outside the static directory exists inside it, unauthenticated attackers can request it to read files such as configuration files, private keys, and application secrets accessible to the process user.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00522,"percentile":0.44665,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-59"],"published":"2026-10-01T10:42:05Z","modified":"2026-11-07T01:46:06Z","fixes":[{"ecosystem":"Alpaquita:25","package":"py3-tornado","fixed_in":["6.5.10-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"py3-tornado","fixed_in":["6.5.10-r0"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"python-tornado","fixed_in":["4.2.1-1ubuntu3.1+esm5"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"python-tornado","fixed_in":["4.5.3-1ubuntu0.2+esm5"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:22.04:LTS","package":"python-tornado","fixed_in":["6.1.0-3ubuntu0.1~esm7"],"sources":["osv"]},{"ecosystem":"Ubuntu:24.04:LTS","package":"python-tornado","fixed_in":["6.4.0-1ubuntu0.7"],"sources":["osv"]},{"ecosystem":"Ubuntu:26.10","package":"python-tornado","fixed_in":["6.5.5-5ubuntu1.2"],"sources":["osv"]},{"ecosystem":"Ubuntu:26.04:LTS","package":"python-tornado","fixed_in":["6.5.4-0.1ubuntu0.3"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"python-tornado","fixed_in":["6.0.3+really5.1.1-3ubuntu0.1~esm8"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure 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When a symlink pointing outside the static directory exists inside it, unauthenticated attackers can request it to read files such as configuration files, private keys, and application secrets accessible to the process user.","status":"published","published":"2026-10-01T11:17:00Z","modified":"2026-11-06T20:15:26.13398199Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"},{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-06T20:52:49.091415Z"},{"id":"AZL-105375","title":"CVE-2026-103263 affecting package python-tornado 6.3.3-11","description":"Tornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links inside the static root without confirming the resolved target stays within it. When a symlink pointing outside the static directory exists inside it, unauthenticated attackers can request it to read files such as configuration files, private keys, and application secrets accessible to the process user.","status":"published","published":"2026-10-01T11:17:21Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:17.719431Z"},{"id":"USN-8952-1","title":"python-tornado vulnerabilities","description":"It was discovered that Tornado did not properly handle certain HTTP requests\nand network inputs. An attacker could possibly use these issues to cause a\ndenial of service, expose sensitive information, or bypass access controls.\n\n(CVE-2023-54397, CVE-2024-14029, CVE-2026-91990, CVE-2026-91992,\nCVE-2026-103262, CVE-2026-103263)","status":"published","published":"2026-10-22T12:07:23Z","modified":"2026-11-06T20:00:46.992536703Z","updated_at":"2026-11-06T20:06:20.037234Z"},{"id":"USN-8952-2","title":"python-tornado regression","description":"USN-8952-1 fixed vulnerabilities in Tornado. Unfortunately that update was incomplete due\nto an incomplete fix for CVE-2026-103263, which broke static file\nserving for applications that subclass Tornado's StaticFileHandler,\nsuch as Jupyter, and could introduce a regression. This update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that Tornado did not properly handle certain HTTP requests\n and network inputs. An attacker could possibly use these issues to cause a\n denial of service, expose sensitive information, or bypass access controls.\n\n (CVE-2023-54397, CVE-2024-14029, CVE-2026-91990, CVE-2026-91992,\n CVE-2026-103262, CVE-2026-103263)","status":"published","published":"2026-11-06T15:04:17Z","modified":"2026-11-07T01:58:36.964727875Z","updated_at":"2026-11-10T03:21:45.931525Z"}]}}