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    CVE-2026-3276

    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.

    Published:Jun 3, 2026
    Last Modified:Aug 11, 2026
    EPS:Jun 3, 2026
    EPSS Score:0.00486
    CVSS Score:5.3

    Affected Products

    Vendor
    Python
    Product
    Cpython

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    https://github.com/python/cpython/commit/6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc0
    https://github.com/python/cpython/commit/90748760d38ca3ac5fc6788a69becab905c95598
    https://github.com/python/cpython/commit/991224b1e8311c85f198f6dd8208bf8cff7fc26f
    https://github.com/python/cpython/commit/ba785b88add96acbf403d65cb157fb2743a33a32
    https://github.com/python/cpython/commit/c5512bd7c1dc28055660565275012766941d3066
    https://github.com/python/cpython/commit/d3ab945af25b28dfe13ac6cb40c124a01b33ce1f
    https://github.com/python/cpython/commit/db744c0776c1d5dd11aaa70eff2a6993c408bacc
    https://github.com/python/cpython/commit/e322a1857084d521f79f45181b776f62e6acfc2c
    https://github.com/python/cpython/issues/149079
    https://github.com/python/cpython/pull/149080
    https://mail.python.org/archives/list/[email protected]/thread/PP5HB4K7727OBBM76KA2ILID76K3OZGZ/
    http://www.openwall.com/lists/oss-security/2026/06/03/15

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High