CVE-2020-7212: Uncontrolled Resource Consumption in urllib3
CVE-2020-7212 · Severity: low · CVSS 3.1 · Published 2020-03-06
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Yes. urllib3 (PyPI): upgrade to 1.25.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
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