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CVE-2026-17084— stringprep.map_table_b2() deviates from RFC 3454 Table B.2

Quick assessment

Affected
Python Software Foundation CPython
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Python是Python基金会开源的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python 3.16.0之前版本存在安全漏洞，该漏洞源于stringprep模块未正确处理RFC 3454表B.2或B.3中的字符，使用最新的Unicode码点属性代替了指定的Unicode 3.2.0，导致处理使用IDNA 2003的域名时出现不匹配。

CVSS 6.0 · Medium EPSS 0.73% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Python Software Foundation CPython < 3.10.22 affected
3.11.0< 3.11.17 affected
3.12.0< 3.12.15 affected
3.13.0< 3.13.16 affected
3.14.0< 3.14.8 affected
3.15.0a1< 3.15.0rc2 affected
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I. Basic Information for CVE-2026-17084

Vulnerability Information
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Vulnerability Title
stringprep.map_table_b2() deviates from RFC 3454 Table B.2
Source: CVE Program / CVE List V5
Vulnerability Description
The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attributes such as case-folding behavior updated since Unicode 3.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Python 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会开源的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python 3.16.0之前版本存在安全漏洞，该漏洞源于stringprep模块未正确处理RFC 3454表B.2或B.3中的字符，使用最新的Unicode码点属性代替了指定的Unicode 3.2.0，导致处理使用IDNA 2003的域名时出现不匹配。
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 ~ 3.10.22 -

II. Public POCs for CVE-2026-17084

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III. Intelligence Information for CVE-2026-17084

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Patches & Fixes for CVE-2026-17084 (9)

Vendor Advisories for CVE-2026-17084 (1)

Other References for CVE-2026-17084 (1)

IV. Related Vulnerabilities

Same product: CPython
Same vendor: Python Software Foundation

V. Comments for CVE-2026-17084

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