CVE-2026-3276

June 4, 2026, 6:16 p.m.

6.3
Medium

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.

Product(s) Impacted

Vendor Product Versions
Python
  • Python
  • *

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-407
Inefficient Algorithmic Complexity
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a python python / / / / / / / /

References

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

Tags

[email protected]
CWE-407
2026-06-03
CVE-2026-3276

CVSS Score

6.3 / 10

CVSS Data - 4.0

  • Attack Vector: NETWORK
  • Attack Complexity: LOW
  • Attack Requirements: PRESENT
  • Privileges Required: NONE
  • User Interaction: NONE
  • Scope:
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: LOW
  • Exploit Maturity: NOT_DEFINED

    • 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

    View Vector String

Timeline

Published: June 3, 2026, 4:16 p.m.
Last Modified: June 4, 2026, 6:16 p.m.

Status : Awaiting Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.