BIT-LIBPYTHON-2026-3276 Potential DoS via quadratic complexity in unicodedata.normalize()

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...

CVE-2026-3276

The CVE concerns Python’s unicodedata.normalize() taking excessive CPU time when given specially crafted Unicode input with long runs of combining characters that have alternating Canonical Combining Class (CCC) values. Affected: the normalize() function across all normalization forms. Root cause...

EUVD-2026-34103

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...

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...

PT-2026-45951

Name of the Vulnerable Software and Affected Versions Python affected versions not specified Description The unicodedata.normalize function can consume excessive CPU time when processing specially crafted Unicode input. This occurs when the input contains long sequences of combining characters wi...