CVE-2026-44431
urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-200 |
| Vendor | urllib3 |
| Product | urllib3 |
| Published | May 13, 2026 |
| Last Updated | May 13, 2026 |
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Affected Versions
urllib3 / urllib3
>= 1.23, < 2.7.0