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CVE-2026-54770: Urljoin Leading Whitespace Open Redirectcve-2026-54770-urljoin-leading-whitespace-open-redirect

Checking for protocol-relative URLs with startswith() without stripping leading whitespace or C0 control characters allows bypasses when followed by urllib.parse.urljoin(), potentially leading to open redirects (CVE-2026-54770).

PythonCVE-2026-54770 CWE-20 CWE-601

by Provallyupdated 2026-09-02Apache-2.0

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