CVE-2020-7212

Katalog CVE

CVSS 7.5 · High EPSS 3,4%

Kerentanan Uncontrolled Resource Consumption pada python urllib3. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

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).

Rincian

Terbit di NVD

6 Maret 2020

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

7.5 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-400: Uncontrolled Resource Consumption

EPSS (30 hari)

3,4% peluang dieksploitasi; lebih tinggi dari 88,4% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://pypi.org/project/urllib3/1.25.8/ release notes · advisory vendor
• https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a patch · advisory pihak ketiga
• https://github.com/urllib3/urllib3/blob/master/CHANGES.rst release notes · advisory pihak ketiga