CVEvulnerability
CVE-2026-3276
6.3 MEDIUM
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-06-03
- Last modified
- 2026-08-13
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 6.3 MEDIUM — 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Weaknesses
- CWE-407
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.
Related
Weakness · CWE (1)
- CWE-407 Inefficient Algorithmic Complexity weakness
References
- https://github.com/python/cpython/commit/6b505d1f41f8f3ea0fe5a4786d3a8fff1875cfc0 github.com
- https://github.com/python/cpython/commit/90748760d38ca3ac5fc6788a69becab905c95598 github.com
- https://github.com/python/cpython/commit/991224b1e8311c85f198f6dd8208bf8cff7fc26f github.com
- https://github.com/python/cpython/commit/ba785b88add96acbf403d65cb157fb2743a33a32 github.com
- https://github.com/python/cpython/commit/c5512bd7c1dc28055660565275012766941d3066 github.com
- https://github.com/python/cpython/commit/d3ab945af25b28dfe13ac6cb40c124a01b33ce1f github.com
- https://github.com/python/cpython/commit/db744c0776c1d5dd11aaa70eff2a6993c408bacc github.com
- https://github.com/python/cpython/commit/e322a1857084d521f79f45181b776f62e6acfc2c github.com
- https://github.com/python/cpython/issues/149079 github.com
- https://github.com/python/cpython/pull/149080 github.com
- https://mail.python.org/archives/list/[email protected]/thread/PP5HB4K7727OBBM76KA2ILID76K3OZGZ/ mail.python.org
- http://www.openwall.com/lists/oss-security/2026/06/03/15 www.openwall.com