CVE-2026-44431
MEDIUM5.3EPSS 0.01%urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
Published: 5/11/2026Modified: 5/15/2026
Also known as:DEBIAN-CVE-2026-44431
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 packages (3)
- Debian/python-urllib3from 0
- PyPI/urllib3>= 1.23, < 2.7.0
- PyPI/urllib3>= 1.23, < 2.7.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |