CVE-2020-7212

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2020-7212
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7212.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2020-7212
Aliases
Downstream
Published
2020-03-06T20:15:12.707Z
Modified
2026-03-15T14:40:31.788046Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

The encodeinvalidchars 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 percentencodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percentencodings 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 percentencodings were deduplicated, the time to compute encodeinvalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).

References

Affected packages

Git / github.com/urllib3/urllib3

Affected ranges

Type
GIT
Repo
https://github.com/urllib3/urllib3
Events
Introduced
49eea8082ab34094d0c53f1d26e5c588d5372d74
Last affected
37ba61a8b8120cbd866d057eaa3936f4b140dee0
Fixed
a74c9cfbaed9f811e7563cfc3dce894928e0221a
Database specific 
{
    "versions": [
        {
            "introduced": "1.25.2"
        },
        {
            "last_affected": "1.25.7"
        }
    ]
}

Affected versions

1.*
1.25.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7212.json"