specially crafted Unicode input containing long runs of combining characters
with alternating Canonical Combining Class values.
This affects all normalization forms.
Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Tue, 16 Jun 2026 15:00:00 +0000
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Fri, 05 Jun 2026 10:45:00 +0000
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| First Time appeared |
Python
Python cpython |
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| Vendors & Products |
Python
Python cpython |
Thu, 04 Jun 2026 17:45:00 +0000
Thu, 04 Jun 2026 00:15:00 +0000
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| Weaknesses | CWE-606 | |
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| Metrics |
threat_severity
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cvssV3_1
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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 |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: PSF
Published:
Updated: 2026-06-16T14:54:50.442Z
Reserved: 2026-02-26T15:19:46.862Z
Link: CVE-2026-3276
Updated: 2026-06-03T19:18:17.828Z
Status : Awaiting Analysis
Published: 2026-06-03T16:16:29.253
Modified: 2026-06-16T15:16:39.610
Link: CVE-2026-3276
OpenCVE Enrichment
Updated: 2026-06-05T10:11:33Z