CVE-2026-123534
Tornado before 6.6 Path Traversal via static_url() Version Hashing
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-22 |
| Vendor | tornadoweb |
| Product | tornado |
| Published | Nov 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Affected Versions
tornadoweb / tornado
0 < 6.6
References
Credits
🔍 TraceHanami