Vulnerability in Python Software Foundation Cpython
CVE-2026-3276
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.
EPSS: 0.000 (13.2th percentile) — read the EPSS interpretation.
Affected products
- Python Software Foundation Cpython — versions 0
Weakness classification (CWE)
References
- cna@python.org (vendor-advisory)
- cna@python.org (patch)
- cna@python.org (issue-tracking)
- af854a3a-2127-422b-91ae-364da2661108
- cna@python.org (patch)
- cna@python.org (patch)
- cna@python.org (patch)
- cna@python.org (patch)