Medium 5.3Published May 13, 2026

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

Updated under an hour ago (2026-10-19 10:00 UTC)

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It affects python urllib3. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for python urllib3

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

python urllib3 python:urllib3	from 1.23 before 2.7.0	NVD

References

https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvcmitigation, vendor-advisory
https://lists.debian.org/debian-lts-announce/2026/06/msg00040.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.