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.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-3610-1 python-urllib3 security update
Debian DLA Debian DLA DLA-3998-1 python-urllib3 security update
EUVD EUVD EUVD-2023-0252 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.
Github GHSA Github GHSA GHSA-v845-jxx5-vc9f `Cookie` HTTP header isn't stripped on cross-origin redirects
Ubuntu USN Ubuntu USN USN-6473-1 urllib3 vulnerabilities
Ubuntu USN Ubuntu USN USN-6473-2 pip vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 03 Nov 2025 22:30:00 +0000

Type Values Removed Values Added
References

Fri, 13 Dec 2024 14:45:00 +0000

Type Values Removed Values Added
References

Fri, 22 Nov 2024 12:00:00 +0000


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-11-03T21:49:44.074Z

Reserved: 2023-09-22T14:51:42.340Z

Link: CVE-2023-43804

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-10-04T17:15:10.163

Modified: 2025-11-03T22:16:27.767

Link: CVE-2023-43804

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-10-04T00:00:00Z

Links: CVE-2023-43804 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses