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.
References (36)
... and 16 more
Scores
CVSS v3
7.5
EPSS
0.0012
EPSS Percentile
31.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-407
Status
published
Products (12)
fedoraproject/fedora
35
fedoraproject/fedora
36
fedoraproject/fedora
37
netapp/active_iq_unified_manager
(2 CPE variants)
netapp/bootstrap_os
netapp/e-series_performance_analyzer
netapp/element_software
netapp/hci
netapp/management_services_for_element_software
netapp/ontap_select_deploy_administration_utility
... and 2 more
Published
Nov 09, 2022
Tracked Since
Feb 18, 2026