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.
Metrics
Affected Vendors & Products
References
History
Wed, 03 Jun 2026 20:30:00 +0000
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Wed, 03 Jun 2026 18:30:00 +0000
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ssvc
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Wed, 03 Jun 2026 16:00:00 +0000
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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. | |
| Title | Potential DoS via quadratic complexity in unicodedata.normalize() | |
| Weaknesses | CWE-407 | |
| References |
| |
| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: PSF
Published:
Updated: 2026-06-03T19:18:17.828Z
Reserved: 2026-02-26T15:19:46.862Z
Link: CVE-2026-3276
Updated: 2026-06-03T19:18:17.828Z
Status : Received
Published: 2026-06-03T16:16:29.253
Modified: 2026-06-03T20:16:20.200
Link: CVE-2026-3276
No data.
OpenCVE Enrichment
Updated: 2026-06-03T18:00:07Z