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CVE-2026-91991— Tornado before 6.5.8 Cookie Attribute Injection via Capitalized kwargs

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 6.5.8 之前版本存在对 Cookie 属性注入漏洞的不完整修复。攻击者可通过向 方法传递大写或旧式关键字参数（如 、 、 ）来注入任意 Cookie 属性。攻击者可以利用分号分隔的数据嵌入在这些大写参数中，从而绕过验证机制，篡改 Cookie 的安全属性。

CVSS 5.4 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
tornadoweb tornado 6.5.5< 6.5.8 affected
6.5.8 unaffected
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I. Basic Information for CVE-2026-91991

Vulnerability Information
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Vulnerability Title
Tornado before 6.5.8 Cookie Attribute Injection via Capitalized kwargs
Source: CVE Program / CVE List V5
Vulnerability Description
Tornado before 6.5.8 contains an incomplete fix for cookie attribute injection that allows attackers to inject arbitrary cookie attributes by passing capitalized or legacy keyword arguments to set_cookie. Attackers can embed semicolon-delimited data in capitalized parameters like Domain, Path, or SameSite to bypass validation and modify cookie security attributes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tornadoweb tornado 6.5.5 ~ 6.5.8 -

II. Public POCs for CVE-2026-91991

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III. Intelligence Information for CVE-2026-91991

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Vendor Advisories for CVE-2026-91991 (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-2026-91992 5.9 MEDIUM Tornado before 6.5.7 Credential Leak via Handle Reuse
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-113

V. Comments for CVE-2026-91991

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