CVE-2026-3276— Potential DoS via quadratic complexity in unicodedata.normalize()
Possible ATT&CK Techniques 1AI
T1496 · Resource HijackingAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Python Software Foundation | CPython | < 3.13.14 | affected |
3.14.0< 3.14.6 | affected | ||
3.15.0a1< 3.15.0b2 | affected |
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I. Basic Information for CVE-2026-3276
Vulnerability Information
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Vulnerability Title
Potential DoS via quadratic complexity in unicodedata.normalize()
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
算法复杂性
Source: NVD (National Vulnerability Database)
Vulnerability Title
CPython 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CPython是Python基金会的一个用C语言实现的Python解释器。 CPython存在安全漏洞，该漏洞源于处理特制Unicode输入时CPU消耗过高，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Python Software Foundation | CPython | 0 ~ 3.13.14 | - |
II. Public POCs for CVE-2026-3276
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-3276 (6)
Mailing List Discussions for CVE-2026-3276 (1)
IV. Related Vulnerabilities
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tarfile extraction filter bypass allows escaping the destina - CVE-2026-12003
CPython >3.11 Insecure Input Validation resulting in privile
Same vendor: Python Software Foundation
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tarfile opened in streaming mode mishandles EOF - CVE-2026-0864
Configuration Injection via Carriage Return (\r) in write() - CVE-2026-11940
tarfile extraction filter bypass allows escaping the destina - CVE-2026-12003
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Same weakness: CWE-407
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V. Comments for CVE-2026-3276
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