CVE-2026-3276

Medium

Open

TLP:CLEAR

Potential DoS via quadratic complexity in unicodedata.normalize()

NVD CVE.org

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Description

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.

Details

CVSS Score: 6.3
EPSS Score ⓘ: 0.49%

39.3th percentile
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Confidence: 90%
Published: Jun 3, 2026
Last Modified: Aug 11, 2026

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