GHSA-hmv2-79q8-fv6g

Source

https://github.com/advisories/GHSA-hmv2-79q8-fv6g

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-hmv2-79q8-fv6g/GHSA-hmv2-79q8-fv6g.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-hmv2-79q8-fv6g

Aliases

Published

2021-04-30T17:31:43Z

Modified

2024-11-18T22:35:00.503678Z

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
8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Uncontrolled Resource Consumption in urllib3

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).

Database specific

{
    "nvd_published_at": "2020-03-06T20:15:00Z",
    "cwe_ids": [
        "CWE-400"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-22T22:04:31Z"
}

References

Affected packages

PyPI / urllib3

Package

Name: urllib3; View open source insights on deps.dev
Purl: pkg:pypi/urllib3

Affected ranges

Type: ECOSYSTEM
Events: Introduced

1.25.2

Fixed

1.25.8

Affected versions

1.*

1.25.2

1.25.3

1.25.4

1.25.5

1.25.6

1.25.7

Database specific

{
    "last_known_affected_version_range": "<= 1.25.7"
}