CVE-2021-33503 (High) detected in urllib3-1.26.4-py2.py3-none-any.whl

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CVE-2021-33503 - High Severity Vulnerability

Vulnerable Library - urllib3-1.26.4-py2.py3-none-any.whl

HTTP library with thread-safe connection pooling, file post, and more.

Library home page: https://files.pythonhosted.org/packages/09/c6/d3e3abe5b4f4f16cf0dfc9240ab7ce10c2baa0e268989a4e3ec19e90c84e/urllib3-1.26.4-py2.py3-none-any.whl

Path to dependency file: /tmp/ws-scm/hoover

Path to vulnerable library: /tmp/ws-scm/hoover

Dependency Hierarchy:

• requests-2.25.1-py2.py3-none-any.whl (Root Library)
  • ❌ urllib3-1.26.4-py2.py3-none-any.whl (Vulnerable Library)

Found in base branch: master

Vulnerability Details

An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.

Publish Date: 2021-06-29

URL: CVE-2021-33503

CVSS 3 Score Details (7.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-q2q7-5pp4-w6pg

Release Date: 2021-06-29

Fix Resolution: urllib3 - 1.26.5