CVE-2026-3276

N/A Unknown

Published: June 03, 2026 Modified: June 16, 2026

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/python/cpython/commit/6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc0

Source: cna@python.org

https://github.com/python/cpython/commit/90748760d38ca3ac5fc6788a69becab905c95598

Source: cna@python.org

https://github.com/python/cpython/commit/991224b1e8311c85f198f6dd8208bf8cff7fc26f

Source: cna@python.org

https://github.com/python/cpython/commit/ba785b88add96acbf403d65cb157fb2743a33a32

Source: cna@python.org

https://github.com/python/cpython/commit/c5512bd7c1dc28055660565275012766941d3066

Source: cna@python.org

https://github.com/python/cpython/issues/149079

Source: cna@python.org

https://github.com/python/cpython/pull/149080

Source: cna@python.org

https://mail.python.org/archives/list/security-announce@python.org/thread/PP5HB4K7727OBBM76KA2ILID76K3OZGZ/

Source: cna@python.org

http://www.openwall.com/lists/oss-security/2026/06/03/15

Source: af854a3a-2127-422b-91ae-364da2661108

9 reference(s) from NVD

Quick Stats

CVSS v3 Score

N/A / 10.0

EPSS (Exploit Probability)

0.5%

37th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-407

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