high5.3
CVE-2026-44431
urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | urllib3 | >= 1.23, < 2.7.0 | 2.7.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Python | Urllib3 | from 1.23 before 2.7.0 |