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VULNERABILITIES

CVE-2026-3276 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
http://www.openwall.com/lists/oss-security/2026/06/03/15 CVE
https://github.com/python/cpython/commit/6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc0 [email protected]
https://github.com/python/cpython/commit/90748760d38ca3ac5fc6788a69becab905c95598 [email protected]
https://github.com/python/cpython/commit/991224b1e8311c85f198f6dd8208bf8cff7fc26f [email protected]
https://github.com/python/cpython/commit/ba785b88add96acbf403d65cb157fb2743a33a32 [email protected]

see all 12 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-407Inefficient Algorithmic Complexity[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

10 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-3276
NVD Published Date:
Jun 3, 2026
NVD Last Modified:
Aug 13, 2026
Source:
[email protected]
CVE-2026-3276 Details - Not Deferred