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CVE-2026-123534— Tornado before 6.6 Path Traversal via static_url() Version Hashing

Quick assessment

Affected
tornadoweb tornado
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tornado 6.6 之前的版本在 和 方法中存在路径遍历漏洞。攻击者可以利用 序列，对位于 目录之外的文件进行哈希运算。若攻击者能够控制传入 的输入参数，则能够获取可读文件的 SHA-512 哈希值以确认其存在；此外，攻击者还可引用 文件，导致事件循环被无限阻塞。

CVSS 6.5 · Medium EPSS 0.34% · P27
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I. Basic Information for CVE-2026-123534

Vulnerability Information
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Vulnerability Title
Tornado before 6.6 Path Traversal via static_url() Version Hashing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tornadoweb tornado 0 ~ 6.6 -

II. Public POCs for CVE-2026-123534

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-123534

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Other References for CVE-2026-123534 (2)

IV. Related Vulnerabilities

Same product: tornado
Same vendor: tornadoweb
Same weakness: CWE-22