PT-2026-39665
CVE-2026-44431
·
Published
2026-05-07
·
Updated
2026-10-19
Description by
CVSS 4.0
8.2
HighMetricsAV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Name of the Vulnerable Software and Affected Versions
urllib3 versions 1.23 through 2.6.x
Description
Sensitive headers, specifically
Authorization, Cookie, and Proxy-Authorization, are forwarded during cross-origin redirects when using the low-level API via ProxyManager.connection from url().urlopen(..., assert same host=False). While high-level APIs like urllib3.request(), PoolManager.request(), and ProxyManager.request() strip these headers by default, the low-level flow fails to do so.Recommendations
Upgrade to version 2.7.0 or later.
Avoid using the low-level redirect flow for cross-origin redirects or switch to
ProxyManager.request().Exploitability
Exploit
Fix
Impacts
Researchers
Vendors
Affected products
Found an issue in the description? Have something to add? Feel free to write us 👾