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CVE-2026-44431

29
FAUCET Score

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.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.23, < 2.7.0CPE matchmatch criteria
cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.2HIGH

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
NONE
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.33%
Probability of exploitation in next 30 days
EPSS Percentile
25.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0033 is in the 15th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

microsoftpatch availablevia msrc
Product: azl3 python-urllib3 2.0.7-4 on Azure Linux 3.0Fixed in: 2.0.7-5
microsoftpatch availablevia msrc
Product: 20831-17084Fixed in: 2.0.7-5
pippatch availablevia ghsa
Product: urllib3Fixed in: 2.7.0
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (2)

microsoft2026-May/CVE-2026-44431Important

urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

May 12, 2026
pipGHSA-qccp-gfcp-xxvchigh

urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

May 11, 2026

References

lists.debian.org / debian-lts-announce/2026/06/msg00040.html
github.com / urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc
MitigationVendor Advisory