CVE-2026-44431
urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
5.3
MEDIUM
CVSS 3.1
EPSS 0.53%
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.
How to fix CVE-2026-44431
To remediate CVE-2026-44431, upgrade the affected package to a fixed version below.
- —upgrade to 1.26.5-1~exp1+deb11u4 or later
Is CVE-2026-44431 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.26.5-1~exp1+deb11u4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| 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 |