Copyright © 2012 Red Hat, Inc. All rights reserved.
Moderate
2026-06-03T14:29:39
python: Python unicodedata: Denial of Service due to excessive CPU consumption
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-606
unicodedata.normalize() can take excessive CPU time when processing
specially crafted Unicode input containing long runs of combining characters
with alternating Canonical Combining Class values.
This affects all normalization forms.
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.
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.
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.
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https://www.cve.org/CVERecord?id=CVE-2026-3276
https://nvd.nist.gov/vuln/detail/CVE-2026-3276
https://github.com/python/cpython/issues/149079
https://github.com/python/cpython/pull/149080
https://mail.python.org/archives/list/security-announce@python.org/thread/PP5HB4K7727OBBM76KA2ILID76K3OZGZ/