CVE-2020-7212
highPriorität · verfolgen · 31EPSS 0.034 · 89. PerzentilEURUUSEPSS · bewertet 2026-10-27
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).
cvss
Technischer Schweregrad, 0–10. Eine Zeile je Quelle.
Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 6.9–7.8
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- GHSA-hmv2-79q8-fv6gUncontrolled Resource Consumption in urllib32021-04-30ghsa · osvUS
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).
- PYSEC-2020-1492020-03-06vendor · osvUS
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).
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Referenzen (11)
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/urllib3/urllib3/blob/master/CHANGES.rstcnnvd
- https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221acnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2020-7212cnnvd
- https://pypi.org/project/urllib3/1.25.8/cnnvd
- https://vigilance.fr/vulnerability/urllib3-overload-via-encode-invalid-chars-45432cnnvd
- https://github.com/urllib3/urllib3/blob/master/CHANGES.rstenisa_euvd
- https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221aenisa_euvd
- https://pypi.org/project/urllib3/1.25.8/enisa_euvd
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