urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.

Project Subscriptions

Vendors Products
Urllib3 Subscribe
Urllib3 Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-qccp-gfcp-xxvc urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 13 May 2026 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Urllib3
Urllib3 urllib3
Vendors & Products Urllib3
Urllib3 urllib3
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 13 May 2026 16:15:00 +0000

Type Values Removed Values Added
Description urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.
Title urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
Weaknesses CWE-200
References
Metrics cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-13T17:17:07.339Z

Reserved: 2026-05-06T14:40:00.954Z

Link: CVE-2026-44431

cve-icon Vulnrichment

Updated: 2026-05-13T17:15:24.639Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-13T16:16:57.150

Modified: 2026-05-13T17:06:37.307

Link: CVE-2026-44431

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T18:15:16Z

Weaknesses