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CVE-2026-44431 urllib3 is an HTTP client library for Python

Description

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 products and versions

Product Affected versions Fixed in
urllib3 1.23 1.23 → < 2.7.0 2.7.0

References

Timeline

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