Information disclosure in urllib3 - CVE-2026-44431

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Main Vulnerability Database Vulnerabilities #VU130907

Information disclosure in urllib3 - CVE-2026-44431

Published: May 9, 2026


Vulnerability identifier: #VU130907
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44431
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to exposure of sensitive information in ProxyManager.connection_from_url().urlopen() when following cross-origin redirects with assert_same_host=False through a proxy. A remote attacker can trigger a cross-origin redirect to disclose sensitive information.

Sensitive headers such as Authorization, Cookie, and Proxy-Authorization may be forwarded across origins in this low-level redirect flow.


Affected software

urllib3
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
Debian Linux
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
SUSE Linux Micro
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Anolis OS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Public Cloud Module
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP Applications
Python 3 Module
Basesystem Module
openSUSE Leap
openEuler
Ubuntu
IBM Cloud Pak for Data System
PowerVC
IBM Watson Speech Services Cartridge for IBM Cloud Pak for Data
IBM Maximo Application Suite - Manage Component
IBM Maximo Application Suite
Python for Scientific Computing
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
python3-urllib3
python-urllib3 (Red Hat package)
python-urllib3
python2-urllib3
python-urllib3 (Ubuntu package)
python311-urllib3_1
python3.12-urllib3 (Red Hat package)
python3-urllib3-doc
python311-urllib3
python-urllib3 (Debian package)
python3.14-urllib3 (Red Hat package)
fence-agents (Red Hat package)
python2-pip
python-pip-wheel
python-pip-help
python-pip
python3-pip
Maximo Application Suite - Location Service for Esri Component
Maximo Application Suite - Visual Inspection Component
StreamSets SDK for Python

How to mitigate CVE-2026-44431

Install security update from vendor's website.

urllib3 - update to 2.7.0
IBM Cloud Pak for Data System - update to 8.10.26.06.SP2
IBM Watson Speech Services Cartridge for IBM Cloud Pak for Data - update to 5.4.0 Patch 3
Python for Scientific Computing - update to 4.3.2
IBM Maximo Application Suite - Manage Component - addressed in versions 9.0.27, 9.1.19
Maximo Application Suite - Location Service for Esri Component - addressed in versions 9.0.10, 9.1.9
IBM Maximo Application Suite - addressed in versions 9.0.27, 9.1.19
Maximo Application Suite - Visual Inspection Component - addressed in versions 9.0.21, 9.1.19
python3-urllib3 - addressed in versions 1.24.2-10, 1.26.19-6
python-urllib3 (Red Hat package) - addressed in versions 1.24.2-10.el8_10, 1.26.5-8.el9_8, 1.26.19-4.el10_2
python-urllib3 - addressed in versions 1.25.9-17, 1.26.12-13, 1.26.18-8
python2-urllib3 - update to 1.25.9-17
python3-urllib3 - addressed in versions 1.25.9-17, 1.26.12-13, 1.26.18-8
python-urllib3 - update to 1.25.10-3.51.1
python3-urllib3 - addressed in versions 1.25.10-3.51.1, 1.25.10-150300.4.27.1
python-urllib3 (Ubuntu package) - addressed in versions 1.26.5-1~exp1ubuntu0.7, 2.0.7-1ubuntu0.7, 2.3.0-3ubuntu0.6, 2.6.3-1ubuntu1.1
python311-urllib3_1 - update to 1.26.18-150600.3.9.1
python3.12-urllib3 (Red Hat package) - addressed in versions 1.26.19-3.el8_10, 1.26.19-3.el9_8
python3-urllib3-doc - update to 1.26.19-6
python311-urllib3 - addressed in versions 2.0.7-150400.7.30.1, 2.1.0-slfo.1.1_5.1, 2.1.0-6.1
python-urllib3 (Debian package) - update to 2.3.0-3+deb13u2
python3.14-urllib3 (Red Hat package) - update to 2.6.3-2.el10_2
fence-agents (Red Hat package) - addressed in versions 4.2.1-65.el8_4.31, 4.2.1-89.el8_6.25, 4.2.1-112.el8_8.20, 4.2.1-129.el8_10.28
StreamSets SDK for Python - update to 7.0.2
python2-pip - update to 20.2.2-19
python-pip-wheel - addressed in versions 20.2.2-19, 21.3.1-18
python-pip-help - addressed in versions 20.2.2-19, 21.3.1-18
python-pip - addressed in versions 20.2.2-19, 21.3.1-18
python3-pip - addressed in versions 20.2.2-19, 21.3.1-18
python-pip-wheel - update to 23.3.1-7
python3-pip - update to 23.3.1-7

External References

Related Security Bulletins