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.
CVE-2021-33503 - High Severity Vulnerability
HTTP library with thread-safe connection pooling, file post, and more.
Library home page: https://files.pythonhosted.org/packages/40/4e/54411cb5f7c69782304a7ab27ba9d7d9a3908cd68b67f6502137342d0d9c/urllib3-1.17-py2.py3-none-any.whl
Path to dependency file: /requirements.txt
Path to vulnerable library: /tmp/ws-ua_20241027232607_XHVFQR/python_OAMJUI/202410272326071/env/lib/python3.8/site-packages/urllib3-1.17.dist-info
Dependency Hierarchy: - :x: **urllib3-1.17-py2.py3-none-any.whl** (Vulnerable Library)
Found in HEAD commit: 83e83af6a33e47edb742829dec5a126039d06dbe
Found in base branch: main
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
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.Type: Upgrade version
Origin: https://github.com/urllib3/urllib3/security/advisories/GHSA-q2q7-5pp4-w6pg
Release Date: 2021-06-29
Fix Resolution: 1.26.5
:rescue_worker_helmet: Automatic Remediation will be attempted for this issue.