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CVE-2023-43804— `Cookie` HTTP header isn't stripped on cross-origin redirects

Quick assessment

Affected
urllib3 urllib3
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.

urllib3是一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3存在信息泄露漏洞，该漏洞源于在跨源重定向期间不会剥离Cookie请求标头，导致HTTP重定向将信息泄漏到其他源。受影响的产品和版本：urllib3 2至2.0.5版本，1.26.16及之前版本。

CVSS 5.9 · Medium EPSS 1.36% · P71

Possible ATT&CK Techniques 1 AI

T1041 · Exfiltration Over C2 Channel
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I. Basic Information for CVE-2023-43804

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
`Cookie` HTTP header isn't stripped on cross-origin redirects
Source: CVE Program / CVE List V5
Vulnerability Description
urllib3 is a user-friendly HTTP client library for Python. urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
urllib3 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
urllib3是一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3存在信息泄露漏洞，该漏洞源于在跨源重定向期间不会剥离Cookie请求标头，导致HTTP重定向将信息泄漏到其他源。受影响的产品和版本：urllib3 2至2.0.5版本，1.26.16及之前版本。
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
urllib3 urllib3 >= 2.0.0, < 2.0.6 -

II. Public POCs for CVE-2023-43804

# POC Description Source Link Shenlong Link
1 Example of how CVE-2023-43804 works with real python code. https://github.com/JawadPy/CVE-2023-43804-Exploit POC Details
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III. Intelligence Information for CVE-2023-43804

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Patches & Fixes for CVE-2023-43804 (2)

Vendor Advisories for CVE-2023-43804 (1)

Mailing List Discussions for CVE-2023-43804 (4)

IV. Related Vulnerabilities

Same product: urllib3
Same vendor: urllib3
Same weakness: CWE-200

V. Comments for CVE-2023-43804

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