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.

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Advisories

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Fixes

Solution

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Workaround

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History

Wed, 03 Jun 2026 20:30:00 +0000

Type Values Removed Values Added
References

Wed, 03 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 03 Jun 2026 16:00:00 +0000

Type Values Removed Values Added
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

{'score': 6.3, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-06-03T19:18:17.828Z

Reserved: 2026-02-26T15:19:46.862Z

Link: CVE-2026-3276

cve-icon Vulnrichment

Updated: 2026-06-03T19:18:17.828Z

cve-icon NVD

Status : Received

Published: 2026-06-03T16:16:29.253

Modified: 2026-06-03T20:16:20.200

Link: CVE-2026-3276

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-03T18:00:07Z

Weaknesses