CVE-2026-3276 (GCVE-0-2026-3276)

Vulnerability from cvelistv5 – Published: 2026-06-03 14:29 – Updated: 2026-08-13 00:28
VLAI
Title
Potential DoS via quadratic complexity in unicodedata.normalize()
Summary
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.
Severity
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-03 17:27 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Python Software Foundation CPython Affected: 0 , < 3.10.21 (python)
Affected: 3.11.0 , < 3.11.16 (python)
Affected: 3.12.0 , < 3.12.14 (python)
Affected: 3.13.0 , < 3.13.14 (python)
Affected: 3.14.0 , < 3.14.6 (python)
Affected: 3.15.0a1 , < 3.15.0b2 (python)
guessed Create a notification for this product.
Credits
Seokchan Yoon (https://github.com/ch4n3-yoon) Tim Peters (https://github.com/tim-one) Bénédikt Tran (https://github.com/picnixz) Serhiy Storchaka (https://github.com/serhiy-storchaka) Stan Ulbrych (https://github.com/StanFromIreland) Seth Larson (https://github.com/sethmlarson) Petr Viktorin (https://github.com/encukou)
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      "cveMetadata": "{\"cveId\": \"CVE-2026-3276\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-13T00:28:05.768Z\", \"dateReserved\": \"2026-02-26T15:19:46.862Z\", \"assignerOrgId\": \"28c92f92-d60d-412d-b760-e73465c3df22\", \"datePublished\": \"2026-06-03T14:29:39.727Z\", \"assignerShortName\": \"PSF\"}",
      "dataType": "CVE_RECORD",
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    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.