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Vulnerability record · CVE-2026-44431 · published 13 May 2026

CVE-2026-44431: Python urllib3 information exposure vulnerability

Python · Urllib3

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.

8.2 CVSS 4.0 High EPSS 0.34% · top 75.3% CWE-200 · Information exposure
8.2CVSS 4.0 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
26 Jun 2026Last modified by NVD

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.

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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-44431), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.