CVE-2026-3276

mediumpriority · track · 0EPSS 0.005 · 41 %ileDEEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.49% (41st) EPSS
CVSS 6.3 · medium
Is it mine?
28 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-21

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

6.3
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.7–6.3

v4.06.3mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.06.3mediumCVSS: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:Xsecondary · cna@python.org
v4.01.7lowCVSS: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:U/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:Xsecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-407US
04

affected products (28)

Products and version ranges known to be affected.

showing 20 of 28
05

advisories (5)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-1971CPython: Mehrere SchwachstellenDeutsch2026-06-16csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in CPython ausnutzen, um Dateien zu manipulieren und um einen Denial-of-Service-Zustand auszulösen

  • BIT-libpython-2026-3276Potential DoS via quadratic complexity in unicodedata.normalize()2026-06-05vendor · osvUS

    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.

  • BIT-python-2026-3276Potential DoS via quadratic complexity in unicodedata.normalize()2026-06-05vendor · osvUS

    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.

  • BIT-python-min-2026-3276Potential DoS via quadratic complexity in unicodedata.normalize()2026-06-05vendor · osvUS

    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.

  • PSF-2026-252026-06-03vendor · osvUS

    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.

06

also known as (7)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdosvcert_bundNVDCVE.orgMITRE
published 2026-06-03modified 2026-08-13
08

references (28)

External citations — patches, advisories, analysis.

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