Import Source
https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-6821.json
JSON Data
https://api.test.osv.dev/v1/vulns/AZL-6821
Upstream
Published
2021-06-29T11:15:07Z
Modified
2026-04-01T05:21:22.302243Z
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
CVE-2021-33503 affecting package python-urllib3 for versions less than 1.25.9-3
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.

References

Affected packages

Azure Linux:2 / python-urllib3

Package

Name
python-urllib3
Purl
pkg:rpm/azure-linux/python-urllib3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.25.9-3

Database specific

source
"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-6821.json"