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CVE-2026-91992— Tornado before 6.5.7 Credential Leak via Handle Reuse

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 6.5.7 之前的版本中，CurlAsyncHTTPClient 存在一个凭据泄露漏洞：pycurl 句柄在多个请求之间被复用，但并未进行适当的状态清除。攻击者可以通过同一个客户端实例发起请求，导致 TLS 证书或代理认证信息在非预期请求中持续存在，从而获取敏感凭据。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-91992

Vulnerability Information
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Vulnerability Title
Tornado before 6.5.7 Credential Leak via Handle Reuse
Source: CVE Program / CVE List V5
Vulnerability Description
Tornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tornadoweb tornado 0 ~ 6.5.7 -

II. Public POCs for CVE-2026-91992

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III. Intelligence Information for CVE-2026-91992

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Vendor Advisories for CVE-2026-91992 (2)

Same Patch Batch · tornadoweb · 2026-09-15 · 6 CVEs total

CVE-2023-54397 7.5 HIGH Tornado before 6.3.3 HTTP Request Smuggling via Content-Length
CVE-2026-91990 7.5 HIGH Tornado before 6.5.8 Memory Amplification DoS via multipart
CVE-2024-14029 7.5 HIGH Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding
CVE-2026-91991 5.4 MEDIUM Tornado before 6.5.8 Cookie Attribute Injection via Capitalized kwargs
CVE-2024-58384 5.4 MEDIUM Tornado before 6.4.1 CRLF Injection via CurlAsyncHTTPClient

IV. Related Vulnerabilities

Same product: tornado
Same vendor: tornadoweb
Same weakness: CWE-200

V. Comments for CVE-2026-91992

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