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HIGHCVE-2026-44431Published Modified CNA GitHub_M

CVE-2026-44431: urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

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.

Metrics

CVSS v4.0
8.2
Severity
HIGH
Fixed in
—
Affected Products
1
Affected packages
  • urllib3 / urllib3
    >= 1.23, < 2.7.0
CVSS 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
References