Updated: 2025-11-10 00:12:25.998685
Description:
An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname. For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | 0.0 | |
| CVSS Version 3.x | HIGH | 7.5 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| CentOS 6 ELS | python | 2.6.6 | 7.5 | HIGH | Released | CLSA-2022:1669236630 | 2022-12-08 10:03:33 | |
| CentOS 7 ELS | python | 2.7.5 | 7.5 | HIGH | Released | CLSA-2023:1697739734 | 2023-10-19 21:09:37 | |
| CentOS 7 ELS | python3 | 3.6.8 | 7.5 | HIGH | Released | CLSA-2023:1697739575 | 2023-10-19 21:09:35 | |
| CentOS 8.4 ELS | python3 | 3.6.8 | 7.5 | HIGH | Released | CLSA-2022:1669237532 | 2022-11-23 16:21:48 | |
| CentOS 8.4 ELS | python2 | 2.7.18 | 7.5 | HIGH | Released | CLSA-2022:1669237735 | 2022-11-23 16:21:49 | |
| CentOS 8.5 ELS | python2 | 2.7.18 | 7.5 | HIGH | Released | CLSA-2022:1669238752 | 2022-11-23 20:21:49 | |
| CentOS 8.5 ELS | python3 | 3.6.8 | 7.5 | HIGH | Released | CLSA-2022:1669238513 | 2022-11-23 20:21:49 | |
| CloudLinux 6 ELS | python | 2.6.6 | 7.5 | HIGH | Released | CLSA-2022:1669239181 | 2022-12-08 10:03:33 | |
| CloudLinux 7 ELS | python | 2.7.5 | 7.5 | HIGH | Released | CLSA-2024:1727289167 | 2024-10-07 10:49:55 | |
| CloudLinux 7 ELS | python3 | 3.6.8 | 7.5 | HIGH | Released | CLSA-2024:1727288754 | 2024-10-07 10:50:30 |