CVE-2021-33503
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Python Urllib3
PublishedJun 29, 2021
First seenJun 29, 2021
How to fix
Update
- python urllib31.26.5 or later
- urllib31.26.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python urllib3 | 1.25.4 ≤ v < 1.26.5 | 1.26.5 |
| fedoraproject fedora | 33, 34 | — |
| oracle enterprise_manager_ops_center | 12.4.0.0 | — |
| oracle instantis_enterprisetrack | 17.1, 17.2, 17.3 | — |
| oracle zfs_storage_appliance_kit | 8.8 | — |
| urllib3PyPI | 1.25.4 ≤ v < 1.26.5 | 1.26.5 |
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