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.
Published: 2026-05-13
Score: 8.2 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-qccp-gfcp-xxvc urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
History

Thu, 14 May 2026 14:00:00 +0000

Type Values Removed Values Added
First Time appeared Python
Python urllib3
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*
Vendors & Products Python
Python urllib3
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


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'}


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 : Analyzed

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

Modified: 2026-05-14T13:56:27.263

Link: CVE-2026-44431

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-14T16:00:15Z

Weaknesses