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python3: urllib basic auth regex denial of service (CVE-2020-8492)
Python 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.
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