Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-49853— Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

Quick assessment

Affected
tornadoweb tornado
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tornado是中国Tornado团队的一款异步网络编程框架。 Tornado 6.5.6之前版本存在信息泄露漏洞，该漏洞源于SimpleAsyncHTTPClient浅拷贝重定向请求且仅移除Host标头，当重定向更改方案、主机或端口时，仍保留Authorization、auth_username、auth_password和auth_mode，可能导致信息泄露。

CVSS 7.7 · High EPSS 0.45% · P38

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
tornadoweb tornado < 6.5.6 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-49853

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient
Source: CVE Program / CVE List V5
Vulnerability Description
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when a redirect changed scheme, host, or port. This issue is fixed in version 6.5.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Tornado 日志信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tornado是中国Tornado团队的一款异步网络编程框架。 Tornado 6.5.6之前版本存在信息泄露漏洞，该漏洞源于SimpleAsyncHTTPClient浅拷贝重定向请求且仅移除Host标头，当重定向更改方案、主机或端口时，仍保留Authorization、auth_username、auth_password和auth_mode，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tornadoweb tornado < 6.5.6 -

II. Public POCs for CVE-2026-49853

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10847 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-49853

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-49853 (2)

Vendor Advisories for CVE-2026-49853 (1)

Vendor Pages for CVE-2026-49853 (1)

Same Patch Batch · tornadoweb · 2026-07-14 · 3 CVEs total

CVE-2026-49855 7.5 HIGH tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)
CVE-2026-49854 5.3 MEDIUM Tornado: Out-of-bounds memory access in C extension

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-49853

No comments yet

Leave a comment