CVE-2026-3276
python: Python unicodedata: Denial of Service due to excessive CPU consumption
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · June 3, 2026
Updated · September 21, 2026
Description
A flaw was found in the unicodedata.normalize() function in Python. This vulnerability allows a remote attacker to cause excessive CPU consumption by providing specially crafted Unicode input. Successful exploitation can lead to a Denial of Service (DoS) on the affected system.
Statement
Moderate: A flaw in the unicodedata.normalize() function in Python can lead to excessive CPU consumption when processing specially crafted Unicode input. This vulnerability could result in a Denial of Service on systems where applications process untrusted Unicode data using this function, impacting the availability of affected Red Hat products.
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 do not 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 · 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-606 · Unchecked Input for Loop Condition