CVE-2026-44431— urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-44431
Vulnerability Information
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Vulnerability Title
urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
urllib3 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
urllib3是urllib3开源的一款Python HTTP库。该产品具有线程安全连接池、文件发布支持等。 urllib3 1.23版本至2.7.0之前版本存在信息泄露漏洞，该漏洞源于通过ProxyManager低层API的跨源重定向仍转发敏感标头。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-44431
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- https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvcx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-44431
IV. Related Vulnerabilities
Same product: urllib3
- CVE-2026-44432
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urllib3 does not control redirects in browsers and Node.js
Same vendor: urllib3
- CVE-2026-44432
urllib3: Decompression-bomb safeguards bypassed in parts of - CVE-2026-21441
urllib3 vulnerable to decompression-bomb safeguard bypass wh - CVE-2025-66471
urllib3 Streaming API improperly handles highly compressed d - CVE-2025-66418
urllib3 allows an unbounded number of links in the decompres - CVE-2025-50182
urllib3 does not control redirects in browsers and Node.js
Same weakness: CWE-200
- CVE-2026-8750
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V. Comments for CVE-2026-44431
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