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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.

PUBLISHED Reserved 2026-05-06 | Published 2026-05-13 | Updated 2026-06-26 | Assigner GitHub_M




HIGH: 8.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Product status

>= 1.23, < 2.7.0
affected

References

lists.debian.org/debian-lts-announce/2026/06/msg00040.html

github.com/...rllib3/security/advisories/GHSA-qccp-gfcp-xxvc

cve.org (CVE-2026-44431)

nvd.nist.gov (CVE-2026-44431)

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