CVE-2024-3651
python-idna: potential DoS via resource consumption via specially crafted inputs to idna.encode()
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 12, 2024
Updated · July 3, 2026
Description
A flaw was found in the python-idna library. A malicious argument was sent to the idna.encode() function can trigger an uncontrolled resource consumption, resulting in a denial of service.
Statement
The vulnerability in the idna.encode() function, allowing for resource consumption via specially crafted arguments, is categorized as a moderate severity issue due to its potential impact on system availability rather than data integrity or confidentiality. While the vulnerability can lead to a denial-of-service condition, it requires the passing of unusually large or maliciously crafted inputs to exploit. Normal usage scenarios typically do not encounter such inputs.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVSS / CWE
CVSS 3.1 · 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-400 · Uncontrolled Resource Consumption